Only citizens of certain countries can visit Vietnam without Vietnam entry visa. Those countries include: 

- Most citizens of ASEAN member countries (Thailand, Indonesia, Singapore, Malaysia, Myanmar, Cambodia, Lao, Philipines and Brunei)  are no need Vietnam visa for visiting Vietnam within 30 days; 

- Citizens of Korea, Japan & Scandinavians (Norway, Denmark, Sweden and Finland passport holders)  are no need Vietnam visa for visit Vietnam within 15 days. 

All other citizens are required to get Vietnam entry visa before departure (Vietnam visa issued prior to departure by Vietnamese consulates or embassies) or a pre-approved Vietnam entry visa (visa is issued on arrival at Vietnam’s International Airports) supplied before arrival in Vietnam.

On arrival in Vietnam, you must complete white and blue duplicate arrival-departure forms. The blue copy is to be kept with your passport at all times. Hotels, guest houses and private hosts must register overnight guests with the local police and these blue forms are essential for this purpose.

Incoming visitors must also fill out duplicate yellow and white customs declaration forms. The yellow copy is to remain with your passport until departure. Don't lose it!