Perhaps you should try some spelling variations:
cong quang » luong quang, thong quang, duong quang
quang dung » quang trung, ung dung, cuong dung
doi chieu » doc hieu, doi chi, mot chieu
dung dang » dung dan, dung dong, dung danh
dang tan » dang tran, dang toan, dang van
tan van » tran van, tang van, luan 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) or (toc thieu)) sach - thanh cong quang dung dang tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sach - thanh cong quang dung dang tan van ban.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sach - thanh cong quang dung dang tan van ban*.