Travel Documents: For a start, even though valid passport and entry visa or visa approval letter to Vietnam are generally required for all visitors; travelers of some countries such as Finland, Norway, Japan, Korea and members of ASEAN are exempted from visa with 15-30 day validity according to unilateral and bilateral visa exemption agreements of Vietnam government.
Others visitors may obtain visa at Embassies & General consulates of Vietnam, travel agencies or on arrival.
Thus, it is likely that may not have to fill in any form when you visit Vietnam.
Please be noted that this is only a brief summary and that customs regulation in Vietnam are subject to change at any time.
These customs and habits are associated with community of villages, communes.