If the ball is near the green, the shot is very important, as a good chip will save par and a poor one will almost seal a bogey, or worse. To score low, I always try to knock it close from the really deep stuff. Knocking it close from there chops one or two strokes from my score and often saves par.
Here are a few ways I found that work to hit it close from the deep rough in Thailand:
1. Use a less lofted club and choke up
2. Keep my hands in front of the ball
3. Put the ball slightly forward in my stance
4. Lean forward with most of my weight on my left foot
5. Use a fast swing to offset the club slowing down from the grass behind the ball.
Some Thailand golf professionals recommend using short irons from the deep rough. But that's very hard for the average golfer. It requires a very strong grip, a steeply descending blow, and strength. Plus, you can't release the club. Otherwise, you'll end up hitting a lot of grass and no ball.