Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
cong thanh » dong thanh, cong trinh, truong thanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong ty
tran tap » toan tap, tran tuan, trang tai
tran tan » tran tuan, tran van, tran thanh

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