Perhaps you should try some spelling variations:
chiet tach » chieu sach
thanh tung » thanh cong
doi chiet » doi chieu, doi chi, doi viet
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
than cao » toan cao, thai cao, than cap
tung va » trung va, tuong va, dung va
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - thanh tung va tong ((cong tan) OR (cong tac)) than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chiet tach - thanh tung va tong ((cong tan) OR (cong tac)) than cao".
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - thanh tung va tong ((cong tan) OR (cong tac)) than cao*.