Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
trung van » truong van, trong van, trung va
van bang » van ban, van nang, von bang
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
cac cau » cac mau, bac cau, ca cau

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 (chiet tach)) - thanh trung van bang ((cong dan) OR (cong tan)) cac cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chiet tach)) - thanh trung van bang ((cong dan) OR (cong tan)) cac cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (chiet tach)) - thanh trung van bang ((cong dan) OR (cong tan)) cac cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chiet tach)) - thanh trung van bang ((cong dan) OR (cong tan)) cac cau*.