Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (hieu qua)) - thanh trung cua nhung ((cong dan) OR (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu qua)) - thanh trung cua nhung ((cong dan) OR (cong san)) toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (hieu qua)) - thanh trung cua nhung ((cong dan) OR (cong san)) toan cau*".