Thank you, it’s a good question and we’re glad you asked it.  A visa may allow one entry before its expiration, or it may permit you to enter at various times.

- A single-entry visa may only be used for one entry for the specific purpose for which it was granted. Putting it simply, a single entry visa permits you to enter Vietnam just once during your visa validity. In other words, as long as you leave Vietnam, your visa will be invalid. If you have the need of entering Vietnam for more than 1 time, you will have to apply for a multiple entry visa.