Look cool and be charming. Smile a lot at strangers. Go to a lounge with a bud, raise your glass to a table of ladies that glance your way. They're looking for you to notice them. If they raise their glass back to you order a round to their table. Smile at them when it arrives. Then go over there and talk to them. This works best if you're only with one friend. Don't bring a pack of hungry dogs with you.
When I lived in Chiang Mai I literally met a girl without even speaking to her until she walked past my table to leave. We had "air communications " all night raising glasses, smiling, pretending to text each other, tossing air messages to each other. Make a game of it. These girls like the cutesy <deleted>.
That was 7 years ago, had a fling with her, wasn't gonna work out as she was extremely jealous but we're still friends to this day.
Remember that in a room full of Thai people, if you're the handsome charming foreigner, you're somewhat of a token. People will notice you , you'll stand out so use it to your advantage.