You have to get a Work Permit if you are a foreigner who doing business in Vietnam (As an officer or a worker).
A work permit is required when working in Vietnam for more than three months. This should ideally be applied 15 days by the employer with Ministry of Labor, Invalids and Social Affairs (MoLISA) before the foreign worker commences their employment. Work permit processing times take 7 business days. Currently, work permits for foreigners are valid for a maximum of three years and are not renewable. A new application must be made if the company wishes to continue employing the foreign worker.
The Employer registers the foreign labor demand with the Department of Labor - Invalids - Social Affairs.
The Employer registers the Work Permit with the Department of Labor - Invalids - Social Affairs.
The needed documents: