Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
anh xquang » anh quan, anh xuan
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh quan, nhanh quang, tinh quang
tuan dung » tuan duong, tran dung, tan dung
dung cong » dung trong
hai toan » hai tan, hach toan, thai doan
bai toan » bai tap

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