how to get from Toishan, Guangdong to Xiamen?

Do you refer to Taishan City?
If yes, you can take coach at Taishan Bus Station, get off at GZ Tianhe Bus Station. The schedules are 07:00, 08:10, 09:00, 10:00, 11:00, 12:15, 13:10, 14:10, 15:20, 16:10, 17:00 and 18:10.
Then transfer the long-distance bus to arrive at Xiamen. They depart at 10:15 and 22:00.