American Airlines has some very low fares from many US airports to many Asia airports. Ho Chi Minh City and Hanoi are under $400 round trip for departures February to April 2016.
American Airlines Los Angeles – Tokyo – Hanoi, Vietnam HAN
$393.86 Thursday March 17 – Wednesday March 23
I’ll leave it at that since I am checking to see if I can plan my own trip to Asia before these fares go away.