Hi Brad

if you enter/exit Vietnam for multiple times, then you will need a multiple entry visa, otherwise single entry is enough. There is No special kind of visa, any valid visa granted by the embassy abroad or Immigration Dept of Vietnam will work the same way.

we hope your question for "Visa for Vietnam and Cambodia" has been answered properly.

For each re-enter to Viet Nam, do we have to pay stamping fee for each time?

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Hi Ly, the stamp fee is one time fee only, so you just need to pay once at the first entry.