Only citizens of certain countries can visit Vietnam without an entry visa (valid for 30 days). Those countries include: most Asean countries, Korea, Japan & Scandinavia (2005). All other citizens are required to get an entry visa before departure (visa issued prior to departure by Vietnamese consulates or embassies) or a pre-approved entry visa (visa is issued on arrival at Vietnam’s international airports) supplied before arrival in Vietnam.
You may consult more information about Vietnam visa at:
www.guidevietnam.com/travel/vietnam-visa-passport.html
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1) Entry permit form
2) Two photos (usually 4cm x 6cm or 3 cm x 4 cm)
3) Your original passport
4) Visa fee
The form and the fee can vary by country, so please check directly with the Vietnamese embassy or consulate to which you are applying.
A business visa usually also requires a letter of support from your sponsor agency or company in Vietnam.