Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
doanh cua » doanh luan
hang cong » dang cong, hang nong, bang cong
cua hang » cua dang, cua nhung, cua cong
tap toan » tap doan, tap quan
bai toan » bai 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: ho ((hieu lang) OR (nhieu tang)) - hanh doanh cua hang cong ((tap toan) OR (bai toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (nhieu tang)) - hanh doanh cua hang cong ((tap toan) or (bai toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (nhieu tang)) - hanh doanh cua hang cong ((tap toan) or (bai toan)) cau*.