Use Of A Machine That Would Then...
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For more on marking an answer as the "Best Answer", please visit our FAQ.www.seat61.com - great website if your planning any travel by train ?
www.fco.gov.uk - visa reqirements - safety advise etc
www.hotelclub.net - hotels all over the world
As Adam 1 says do it all when you get there. Sort your Cambodia visa out in Bangkok. Once yout ready to move on from Cambodia you can arrange your Vietnam visa and the same when you ready to go on to Laos from Vietnam. It takes about 2-3 days to do. The majority of guest houses / hotels you'll end up staying at can provide a visa service and theres tour operators all over the place.