VN 10292500 Economy VND CNX Chiang Mai TH Thailand HAN Hanoi VN Vietnam airfare.com 2009-12-13T00:00:00Z QV 17201900 Economy VND CNX Chiang Mai TH Thailand HAN Hanoi VN Vietnam airfare.com 2009-12-03T00:00:00Z TG 18669700 Economy VND CNX Chiang Mai TH Thailand HAN Hanoi VN Vietnam airfare.com 2009-12-13T00:00:00Z