Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
trung qua » trung quan, trong qua, trung cua
qua nhung » quan nhung, cua nhung, qua chung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, phan cau, than cap
hieu ca » hieu cac, hieu cua, hieu va

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

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