Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
anh xquang » anh quan, anh xuan
tran nhung » tranh nhung, tran hung, tren nhung
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh quan, nhanh quang, tinh quang
cong tap » cuong tap, cong tac, cong tan
cong san » cong tac
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) OR (anh xquang)) tran nhung ((cong tap) OR (cong san)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((anh quang) OR (anh xquang)) tran nhung ((cong tap) or (cong san)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh quang) OR (anh xquang)) tran nhung ((cong tap) or (cong san)) toan cau*.