Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, anh quan, nhanh quang
tuan hung » tran hung, luan hung, tuan dung
tan dung » tran dung, tin dung, van dung
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 ((tuan hung) or (tan dung)) cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - anh quang ((tuan hung) OR (tan dung)) cong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh quang ((tuan hung) or (tan dung)) cong tan toan cau*.