Spouse and fiancé petitions
We prepare and manage K-1, CR-1, and IR-1 cases, including USCIS filings, NVC processing, civil documents, and interview preparation.
Ask about this service
PROFESSIONAL CASE MANAGEMENT • ENGLISH & VIETNAMESE SERVICE
Case Management Service:
Specializing in Immigration.
VânSơn provides comprehensive preparation and case-management services for U.S. family-based immigration petitions involving spouses, children, parents, and other relatives. We remain closely involved throughout all three stages: (1) filing the petition with U.S. Citizenship and Immigration Services (USCIS); (2) completing processing with the National Visa Center (NVC); and (3) preparing for and completing the interview at the U.S. Consulate.
More than filling out forms Attorney network when needed We tell you when a case needs an attorney
Does your case need an attorney?We will tell you plainly and connect you with the right attorney instead of taking work outside our scope.
01Understand the caseNot simply entering data into forms.
02Manage the processTrack the matter from beginning to completion.
03Know the limitsBring in the right attorney when legal advice or representation is needed.
01/ 03
NVC PRIORITY-DATE TRACKING
Enroll in case tracking for $300
As your priority date gets closer, VânSơn checks the case regularly so you have time to prepare before NVC contacts you. The full $300 is applied to your service fee when VânSơn begins working on the case.
Buy $300 case tracking
THE PERSON WORKING DIRECTLY WITH YOUDavid Carl Williams
David Carl Williams
Lý Long Sơn
An American who was born and raised in the US who is fluent in Vietnamese Language and has extensive knowledge of the US and Vietnamese legal systems, David personally reviews each case, explains every step clearly, and is transparent from the outset when a client's matter requires an attorney's involvement.
Certified Vietnamese court interpreter in Washington, Texas, and Oklahoma CoreCHI-Performance certified medical interpreter Licensed private investigator in Washington, Texas, and Oklahoma Notary public in Washington, Texas, and Oklahoma Paralegal Certificate Bachelor's degree in Criminal Justice Attorney network when a case needs legal advice or representation
Submit case information PRIMARY SERVICESFamily immigration, marriage,
Family immigration, marriage,
and other services.
VânSơn handles document preparation, case management, translation, and U.S.–Vietnam coordination in one place.
Petitions for children, parents, and relatives
We handle petitions for children, parents, siblings, and other family-preference categories from the initial filing through consular processing.
Ask about this serviceMarriage in the U.S. and adjustment of status
Paperwork for people who entered lawfully, later married a U.S. citizen, and are applying to adjust status.
Ask about this serviceConditional green cards and cases after divorce
We prepare I-751 filings and joint-filing waiver cases when a marriage ends before the two-year green card expires.
Ask about this serviceThe six NVC steps and consular processing
We help with CEAC, DS-260, I-864, civil documents, case tracking, and preparation for the consular interview.
Ask about this servicePriority-date tracking
We check the Visa Bulletin and case status regularly so clients have time to prepare before NVC contacts them.
Ask about this serviceUncontested divorce
We prepare agreed-divorce paperwork, including cases where the other spouse lives in Vietnam or cannot be found.
Ask about this serviceOnline marriage
We help with online-marriage registration, the marriage certificate, translation, and documents needed in the United States or Vietnam.
Ask about this serviceTranslation and U.S.–Vietnam documents
English–Vietnamese translation, certified translations, authentication, legalization, and help sending or receiving documents.
Ask about this serviceOther services: If you also need translation, notary service, document retrieval, or help coordinating paperwork between the United States and Vietnam, VânSơn may be able to help.
View other servicesLATEST NEWS
News and practical guidance
APOSTILLE • SEPTEMBER 11, 2026
Vietnam’s new process will make document use easier
See what is changing and how to prepare documents for use in Vietnam.
Read the article NVC • SEPTEMBER 2026When can you begin the NVC Six Steps?
Learn the difference between Final Action Dates and Dates for Filing.
Read the article EB-3 • OFFICIAL FIGURESHow many Vietnamese people have actually completed EB-3?
Review official figures from 2021 through 2024 and the real stages of a case.
Read the Vietnamese articleSTART ONLINEChoose the right form
Choose the right form
for your case.
Send us some basic information so VânSơn can review the case and tell you which documents to gather. Forms are available in English and Vietnamese.
IMMIGRATION
Open English form English immigration intake
For family petitions, NVC processing, adjustment of status, and other immigration matters.
HỒ SƠ DI TRÚ
Open Vietnamese form Vietnamese immigration intake
Vietnamese-language form for family petitions, NVC, adjustment of status, and other immigration cases.
MARRIAGE / HÔN NHÂN
Open marriage form Bilingual marriage intake
Marriage information in English and Vietnamese in one form.
DIVORCE / LY HÔN
English–Vietnamese divorce intake
Choose English or Vietnamese. Fill out the form and click Submit to send your information to VânSơn.
Information in these forms is used for preliminary review. Submitting a form does not create an attorney–client relationship or guarantee a case result.
COMPLICATED CASESWhen life changes,
When life changes,
the paperwork may change too.
Some cases cannot be handled with one simple form. We sort out the work we can do, help collect and organize the evidence, and bring in an attorney when legal advice or representation is needed.
Adjustment of status after lawful entry and marriage to a U.S. citizen
I-751 joint-filing waivers after divorce or the end of a marriage
Divorce when a spouse is in Vietnam or cannot be located
Death of the petitioner and humanitarian reinstatement requests
RFEs, missing documents, supplemental evidence, and disorganized case files
Citizenship, green cards, work permits, and related documents
HOW TO START
Three simple steps.
Send your case information
Tell us the case category, priority date, and which documents you have received.
Review the case
We tell you what VânSơn can handle and which documents you need to gather.
Prepare and track the case
We organize and review the paperwork, prepare it for filing, and track the case through each stage.
QUICK VânSơn INQUIRY
How can VânSơn help you?
Tell us what is going on in a few short sentences. We will ask for more information if we need it.
Complete the form and select Send inquiry. You can also text (+1) 918-204-4500 or contact VânSơn through Messenger.START YOUR CASE
Talk with VânSơn.
David Carl Williams — Vietnamese name: Lý Long Sơn.
David speaks Vietnamese fluently.
Headquarters and mailing address7122 South Sheridan Road, Suite 2613
Tulsa, Oklahoma 74133Secure payment through StripePay VânSơnHeadquarters / Direct line(+1) 918-204-4500Hotline(+1) 888-993-4248Seattle phone(+1) 206-290-7100Dallas phone(+1) 469-312-0099Vietnam phoneKhải (+84) 0907976721Vietnam phoneKhoa (+84) 0933044586Zalo(+1) 918-204-4500Emailvansondichvu@gmail.comFacebookVânSơn ServicesMessengerMessage VânSơn
Tulsa, Oklahoma 74133Secure payment through StripePay VânSơnHeadquarters / Direct line(+1) 918-204-4500Hotline(+1) 888-993-4248Seattle phone(+1) 206-290-7100Dallas phone(+1) 469-312-0099Vietnam phoneKhải (+84) 0907976721Vietnam phoneKhoa (+84) 0933044586Zalo(+1) 918-204-4500Emailvansondichvu@gmail.comFacebookVânSơn ServicesMessengerMessage VânSơn