Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
doi chieu » doc hieu, doi chi, ho chieu
cua nhung » va nhung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
tran tap » toan tap, tran tan, tran tuan

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