Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
trung cua » truong cua, trung tuan, trung cap
cong doan » cong dan, dong doanh, cong san
cong hoan » cong hoa, dong hoa, cong san
cua dung » cua dang, cua dong, qua dung
phan dau » phan tu, hang dau

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) OR (chiet tach)) - thanh trung cua dung ((cong doan) or (cong hoan)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - thanh trung cua dung ((cong doan) OR (cong hoan)) phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chiet tach)) - thanh trung cua dung ((cong doan) or (cong hoan)) phan dau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chiet tach)) - thanh trung cua dung ((cong doan) or (cong hoan)) phan dau*.