Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
manh huong » anh huong, manh hung, manh cuong
huong cua » dung cua
ban cong » bang cong, van cong, phan cong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban
co sach » bo sach, cuon sach, hoc sach

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) or (co sach)) - manh huong cua ban cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (co sach)) - manh huong cua ban cong tap toan ban.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (co sach)) - manh huong cua ban cong tap toan ban*.