Like in any other countries there is no lack of taxis in Vietnam. You will always find one in front of airports, bus or train stations, hotels or popular tourist sites, and of course on the road. Especially when arriving in a new place it is always tempting to jump into a taxi if you don’t know where your accommodation is. So there shouldn’t be any lack of transportation.
Unfortunately the reputation of taxis in Vietnam is not very good, which probably applies to most SEA countries. THere are many reports of tourists scammed – and we are not talking about $1 or $2. In some instances passengers were even attacked. And it is not just tourists who get scammed – the taxi drivers do it ot the locals as well.