Before you travel to the Vietnam, please check visa requirements and make sure you have a valid visa if needed.
Vietnam visa requirements for Cambodia
There is a common, and short, checklist of what you need in order to apply for a Vietnam visa. This list applies for Cambodia passport-holders. If you apply for special visa type (other than the tourist visa), additional documents may be required.
The following documents are required to apply for a Vietnam visa
Passport: A passport with at least 6-month validity from the date of travel. Temporary passport may be declined.
Photo: Two passport sized photos (4x6 cm and must be recently taken with no glass-wear)
Application form: M3 entry/exit form (for visa on arrival).
Stamping fee: Pay by cash upon arrival (for visa on arrival).
Approval letter: This is required if you want to obtain the visa on arrival at Vietnam's airport.