I sell stock photography and it's becoming increasingly difficult to keep up with my work. Does anyone here have any recommendations of Thai companies that do keywording and post-production?

Inasmuch as I don't know any company's in Thailand that undertake this work, I personally would be a little wary of out-sourcing my images for fear of "theft".

Some years back a pro friend of mine took this route and was amazed to see his images popping up on various stock sites which he knew nothing about. It transpired that a rogue technician had opted to amend the embedded metadata to "create" his own images!

Good luck in your endeavors.