Most citizens of ASEAN member-countries such as Thailand, Indonesia, Singapore, Malaysia, Cambodia, and Laos do not need a Vietnam visa if they visit Vietnam within 30 days.
The Philippine passport holders do not need a Vietnamese visa for 21 days and Myanmar and Brunei do not need Visa within 14 days.They could apply for a popular passport type with return tickets.
The Vietnamese government exempts Visas for nationals of countries as: France, Germany, Spain, United Kingdom and Italy, Japan, Finland, South of Korea. They do not need a visa if staying in Vietnam for less than 15 days regardless of their purpose or type of visa.
All other citizens are required to get a Vietnam entry visa (issued prior to departure by local consulates or embassies) or a pre-approved letter for picking up an entry visa (issued on arrival at Vietnam's International Airports) at the airport. Both are supplied before arrival in the country.