Most visitors to Vietnam need a visa to enter Vietnam and some nationalities have a visa exemption. Please see the visa exemption list on this link: 

https://lanhsuvietnam.gov.vn/Lists/BaiViet/B%C3%A0i%20vi%E1%BA%BFt/DispForm.aspx?List=dc7c7d75-6a32-4215-afeb-47d4bee70eee&ID=306

The entry visas are obtainable from the nearest Vietnamese Embassy, a travel agent or upon arrival. The validity of tourist visas is about one month and could be extended. Photo, passport and personal data required must be given.

Note: There are some countries which could not get visa upon arrival, you need to contact Vietnam Embassy in your country or region

About Visa to Laos and Cambodia, you can get Visa on arrival at the border gate/ international airport. 

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