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, 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.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - anh quang ((trung hung) or (trinh dung)) cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - anh quang ((trung hung) OR (trinh dung)) cong tan toan cau*.