Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
dan phan » doan phan, van phan, dam phan
dan chan » dan gian, dan ca, van chat
va dung » van dung, va duong, vat dung

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 - canh tranh va dung cong ((dan phan) OR (dan chan)) cac~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh tranh va dung cong ((dan phan) or (dan chan)) cac*.