Perhaps you should try some spelling variations:
chiet tach » chieu sach
thanh tung » thanh cong
bang cong » dang cong, bang song, hang cong
cong san » cong tac
san than » sang than, san thanh, ban than
than cao » toan cao, thai cao, than cap
va bang » va nang, va lang, va ban
tinh » trinh, dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((trieu tinh) or (chiet tach)) - ((thanh trung) or (thanh tung)) va bang cong san than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((trieu tinh) OR (chiet tach)) - ((thanh trung) OR (thanh tung)) va bang cong san than cao.
• Adding a wildcard symbol may retrieve word variants: doi ((trieu tinh) or (chiet tach)) - ((thanh trung) or (thanh tung)) va bang cong san than cao*.