Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tuan phung » tuan hung, tuan phong, tran phuong
cong thanh » dong thanh, cong trinh, truong thanh
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, anh quan, tinh quang
cong tan » cong tac, cong san, cong ty
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) or (nhanh quang)) tuan phung ((cong tan) OR (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((anh quang) OR (nhanh quang)) tuan phung ((cong tan) OR (cong thanh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((anh quang) or (nhanh quang)) tuan phung ((cong tan) OR (cong thanh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh quang) or (nhanh quang)) tuan phung ((cong tan) OR (cong thanh)) toan cao*.