Perhaps you should try some spelling variations:
duong quang » dung quang, luong quang, duong qua
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
canh doanh » hanh doanh, chinh doanh, doanh doanh
doanh chua » doanh cua, doanh chu, doanh chung
bang duong » bang suong, bang tuong, tang duong
chua bang » chu bang, chua nang, chua xang
tuan cau » quan cau, tuan cu, thuan cam
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: hoc ((thieu sach) or (chieu sach)) - canh doanh chua bang duong quang ((tuan cau) OR (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chieu sach)) - canh doanh chua bang duong quang ((tuan cau) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (chieu sach)) - canh doanh chua bang duong quang ((tuan cau) OR (toan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (chieu sach)) - canh doanh chua bang duong quang ((tuan cau) OR (toan cau))*.