Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
danh trung » dang trung, dinh trung, manh trung
doi chieu » doc hieu, doi chi, ho chieu
manh hung » anh huong
van thanh » ban thanh, van tuan
cua dung » cua dang, cua dong, qua dung
van toan » van tuan, van tan, manh toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((danh trung) OR (manh hung)) cua dung trong ((van toan) OR (van thanh)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((danh trung) or (manh hung)) cua dung trong ((van toan) OR (van thanh)) cao~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((danh trung) or (manh hung)) cua dung trong ((van toan) OR (van thanh)) cao*.