Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
anh xquang » anh quan, anh xuan
tran phung » tran phuong, trang phung, tran hung
phung cong » nhung cong, phong cong, nhung chong
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh quan, nhanh quang, tinh quang
tap toan » tap doan, tap quan
bai toan » bai tap

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 - ((anh quang) OR (anh xquang)) tran phung cong ((tap toan) OR (bai toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((anh quang) or (anh xquang)) tran phung cong ((tap toan) OR (bai toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh quang) or (anh xquang)) tran phung cong ((tap toan) OR (bai toan)) cau*.