Three Month Multiple Entry Visa means the visa is valid in three months and you can go in and out Vietnam as any times as you wish within three months...
Only citizens of certain countries can visit Vietnam without an entry visa (valid for visit within 30 days). Those countries include: Thailand, Philippine, Malaysia, Singapore, Indonesia, Laos, Korea, Japan & Scandinavians (2005)....
What is a 'Visa on Arrival ? This is most likely the easiest way to obtain your visa without having to chase down embassies, consulates and the like prior to your trip, and is a valid alternative when applying for a tourist visa....
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