Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
trong dan » trong dang, trong san, trong tan
anh tang » anh bang, anh nang, anh sang
anh dang » anh dong, anh dung, anh bang
va dung » van dung, va duong, vat dung
dan van » dang van, doan van, dao van

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 - ((anh tang) or (anh dang)) va dung trong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((anh tang) OR (anh dang)) va dung trong dan van ban.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh tang) or (anh dang)) va dung trong dan van ban*.