Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
anh xquang » anh quan, anh xuan
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh quan, nhanh quang, tinh quang
tran hung » tran hong, tran quang, tran hoang
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan tap » toan ban

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