Hmmmm, I'm not so sure that HKG won't give a good fare deal for some of the possibilities, most likely probably for HKG-BKK-CNX return, and then with the purchase of a couple of domestic tix, or perhaps an open jaw HKG-BKK-CNX//HKT-BKK-HKG with a single dom sector in Y CNX-HKT.

There were some amazing TG fares ex-HKG (mileage earning too) when I was planning on doing a complicated BKK-HKG-SIN-HAN return midi-mileage run. The fare were for HKG-HAN via BKK, and were almost cheaper than BKK-HAN direct.

Sadly, let down by doing the initial BKK-HKG, but that's another story.