Perhaps you should try some spelling variations:
chiet tach » chieu sach
cong thanh » dong thanh, cong trinh, truong thanh
nang hang » nang sang, hang hang, cang thang
ho chiet » ho chieu, ho thiet, hoc thiet
cong tan » cong tac, cong san, cong ty
ran cau » van cau, ban cau, tran chau
can cau » van cau, ban cau, ca cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - nang hang va nhung ((cong tan) OR (cong thanh)) ((ran cau) or (can cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - nang hang va nhung ((cong tan) OR (cong thanh)) ((ran cau) OR (can cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - nang hang va nhung ((cong tan) OR (cong thanh)) ((ran cau) or (can cau))".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - nang hang va nhung ((cong tan) OR (cong thanh)) ((ran cau) or (can cau))*.