Perhaps you should try some spelling variations:
trong quang » truong quang, thong quang, trong quan
chieu sach » chinh sach, chiet tach, chieu sang
trung quan » truong quan, trong quan, trung tuan
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, anh quan, nhanh quang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan 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 ((trung quan) OR (trong quang)) cong tan toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh quang ((trung quan) or (trong quang)) cong tan toan cau*.