Perhaps you should try some spelling variations:
chiet tach » chieu sach
cong thanh » dong thanh, cong trinh, truong thanh
doi chiet » doi chieu, doi chi, doi viet
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong ty
than cao » toan cao, thai cao, than cap
tung va » tuong va, dung va, vung va

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) or (trung va)) thong ((cong tan) or (cong thanh)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - thanh ((tung va) OR (trung va)) thong ((cong tan) OR (cong thanh)) than cao.
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - thanh ((tung va) or (trung va)) thong ((cong tan) or (cong thanh)) than cao*.