Use the attachment directly! DON'T USE your orginal file to modify (I've modified your format). Modify your thesis according to my red words!
You have to attend the defense, I've asked the student office!
The first page of your main text is not right. You should talk about “Trade between Thailand and China” from the beginning!
4.1 should talk about Problems of Trade between Thailand and China, you haven’t focus on this right now!)