Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
doc hieu » toc thieu, hoc thieu, hoc hien
tung cua » trung cua, tuong cua, dung cua
cua dong » chua dong, cua cong, cua dang
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - thanh tung cua dong ((cong tan) or (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - thanh tung cua dong ((cong tan) OR (cong tac)) toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - thanh tung cua dong ((cong tan) or (cong tac)) toan cao*.