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 dung » tuan duong, tan dung, tuan dang
tran dung » tran dang, tran hung, tran quang
cong tap » cuong tap, cong tac, cong tan
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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 dung) or (tran dung)) cong tap ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - anh quang ((tuan dung) OR (tran dung)) cong tap ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - anh quang ((tuan dung) or (tran dung)) cong tap ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh quang ((tuan dung) or (tran dung)) cong tap ((toan cau) OR (toan tap))*.