I'm planning a 3-month trip around Southeast Asia, and my current plan is to fly into Da Nang to do Hue and Hoi An, then go south to reach HCMC. From there, I'm traveling onward to Cambodia and Laos, then swinging back into Vietnam at Hanoi. This works well with the weather conditions (I'm traveling from end of August until beginning of December), and I'm hopping over to Myanmar after I finish in Hanoi.I'm a US citizen in Seoul at the moment. My question is this: what's the best visa for me to get?Or is a better approach for me to get two separate 1-month single-entry visas? Is that possible to get two so close together? What 'll I do now?