Perhaps you should try some spelling variations:
thanh trung » thanh tung
tieu sach » chieu sach, dien sach, te sach
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
van chat » cao chat
van cau » van dau, van hau, toan cau

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

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