Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
cong lang » cong vang, cong luong, cong quang
trung va » truong va, trang va, trung ha
cong san » cong tac
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - thanh trung va nhung ((cong lang) or (cong san)) than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh trung va nhung ((cong lang) OR (cong san)) than cap.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh trung va nhung ((cong lang) or (cong san)) than cap*.