Visas and border crossings forum

Your border questions are very unclear...

If you're asking if it's possible to go from Laos to Vietnam and back to Laos on only one Laos visa then the answer is no unless you've arranged for a multiple entry visa. Otherwise you would need to get a new visa for each time you enter Laos. Laos visas are available at the border but I believe they're only single entry. Vietnam visas are not available at the border, you must possess a Vietnam visa at the time you reach the Vietnam border (i.e. you got it before-hand). For Cambodia > Laos > Cambodia you would need 3 visas total, one for each crossing unless you have a multiple entry visa for Cambodia. Cambodia visas are available at the border. For Thailand > Laos > Thailand, you could do this without a Thailand visa at all depending on how long you're staying in Thailand. You would of course need the Laos visa. When entering Thailand by air you're given a free 30 day stay without a visa or 15 days if entering by land. Unless your 60 day Thailand visa is a multiple entry it becomes invalid the moment you leave the country, so you can't go to Laos and then return to Thailand using the same 60 day visa (unless it's multiple entry). Read up in the "visas and border crossings" section of the forum - all your answers are there.