When I go to Viet Nam I do not eat in the Restaurants. I eat in the stalls and the housefronts that have one or two small tables and a cooker, that serve only one item. You find the stall that serves what you want and it doesn't really matter because it is all delicious. You follow certain rules when you eat this way like eating only what has been cooked and don't drink the water unless it is served in a sealed bottle and is a major brand, or drink beer instead. The locals pretty much follow those rules, too. I got sick briefly once but that was from a bad cham cham fruit that I should have recognized. The only cooked dish that I found that I do not like is duck eggs. Southeast Asian food is nearly all superb and Vietnamese is the best of the best.
I always wondered what kind of meat was on those bamboo sticks. When asked, they would usually say "no speaky, no speaky." Had to neutralize that rot gut beer somehow. Oh, to have the stomach now that I had then.