Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
manh hung » anh huong
trong van » trong cac
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
cap can » cap han, cap van, cap bang
tap can » tap van, tap cac, tac can

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 - manh hung ((cap can) or (tap can)) trong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - manh hung ((cap can) OR (tap can)) trong van toan cao.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - manh hung ((cap can) or (tap can)) trong van toan cao*.