Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh han » hanh nhan, hanh phan, hanh san
cam hung » cac chung, cam nang, van hung
cong van » cong vang, song van, cong tan
cong san » cong tac
toan ban » van ban
han cam » phan cam, ban cam, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (chiet tach)) - hanh han cam hung ((cong van) OR (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh han cam hung ((cong van) OR (cong san)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chiet tach)) - hanh han cam hung ((cong van) OR (cong san)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh han cam hung ((cong van) OR (cong san)) toan ban*.