Perhaps you should try some spelling variations:
thanh trung » thanh tung
tieu sang » chieu sang, tieu dung, tiem nang
trung cua » truong cua, trung tuan, trung cap
cua khong » hua khong, cua phuong, cua thuong
cong dan » cong san, cong tan, huong dan
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: theo tieu sang - thanh trung cua khong ((cong dan) or (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sang - thanh trung cua khong ((cong dan) OR (cong tac)) toan cao.
• Adding a wildcard symbol may retrieve word variants: theo tieu sang - thanh trung cua khong ((cong dan) or (cong tac)) toan cao*.