Perhaps you should try some spelling variations:
trung thanh » truong thanh
truong cua » truong ca, truong quan, truong cao
nhung cong » dung cong, thong cong, hang cong
tieu danh » dieu danh, tiep danh, thien danh
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu danh - thanh ((trung thanh) OR (truong cua)) nhung cong tac toan cao~.
• Adding a wildcard symbol may retrieve word variants: theo tieu danh - thanh ((trung thanh) or (truong cua)) nhung cong tac toan cao*.