Vietnam visa for Myanmar citizens

/Tag:Vietnam visa for Myanmar citizens
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Vietnam visa requirements for Myanmar citizens

I am Myanmar passport holders and currently working in UK. I will visit Vietnam in March 2014 for about 20 days, and then I will visit Cambodia by land for 2 days, and then come back to Vietnam by land to have a flight home 2 days later. Do I need to apply for a multiple entry visa or just a single entry visa for Vietnam? Thank you