Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
hanh tang » hanh trang, anh tang, hanh mang
hung cong » nhung cong, hung cuong, phung cong
manh toan » thanh toan, anh tuan, tinh toan
tang dan » tang van, tung dan, tang luan
dan hung » dang hung, doan hung, dan dung
van tan » van tuan, van ban, van tai

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 - hanh tang dan hung cong ((manh toan) OR (van tan)) ban~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh tang dan hung cong ((manh toan) or (van tan)) ban*.