This post made me jealous and mad I had to cut Vietnam out of my trip last month. Just not enough time to hit 4 countries in 1 month.(You can, but you don't get to experience the whole country/relax and enjoy your trip)
Looks amazing, need to get back over there and visit Vietnam
If you have the chance you should! it's my favorite country in asia so far. And that's true, 4 countries in 1 month is quite much ;)