Travelling to the Socialist Republic of Vietnam, you need valid passport or any other valid travelling document, and the respective entry visa. The visa is granted at Vietnam Embassy abroad. You have to pay the respective charges (fee), dependent on one way or multiply entries to the country.
On arrival, you will be asked to fill in several questionnares, informing about your health state and assumed length of passenger´s stay in Vietnam.
The international driving licence is not valid in Vietnam.
Information and warnings on travelling abroad is to be found HERE.