L-1 is a visa granted to foreigners who are working for a U.S. company outside the U.S. or an international company with a branch in the U.S. The processing duration for this is from 4 (four) to 6 (six) months.
He/she is in the management level and has a special skill or knowledge valuable enough to be transferred to the U.S
He/she works as a manager at the same company/subsidiary/branch in the U.S.
He/she has been working for the current company for at least 1 (one) year within the past 3 (three) years and was invited by the company to work for a period in the main office or its subsidiary.
He/she needs to demonstrate the relationship between the Vietnamese and U.S. companies.