Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
tuan thong » tran thong, tuan phong, xuan thong
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap
tinh » trinh, dinh, minh
toan » tran

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((trieu tinh) or (chieu sach)) - thanh trung ((tuan thong) OR (toan thong)) cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((trieu tinh) OR (chieu sach)) - thanh trung ((tuan thong) OR (toan thong)) cong tac than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((trieu tinh) or (chieu sach)) - thanh trung ((tuan thong) OR (toan thong)) cong tac than cau".
• Adding a wildcard symbol may retrieve word variants: doi ((trieu tinh) or (chieu sach)) - thanh trung ((tuan thong) OR (toan thong)) cong tac than cau*.