Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung hung » trung dung, trong hung, truong chung
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, nhanh quang, tinh quang
hung cong » nhung cong, hung cuong, phung cong
anh quan » anh tuan, ban quan, anh nhan
tap quan » tac quan
hai quan » tac quan

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 quang) OR (anh quan)) trung hung cong ((tap quan) or (hai quan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((anh quang) OR (anh quan)) trung hung cong ((tap quan) OR (hai quan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((anh quang) OR (anh quan)) trung hung cong ((tap quan) or (hai quan)) cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh quang) OR (anh quan)) trung hung cong ((tap quan) or (hai quan)) cau*.