Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hieu quang » thieu quang, hieu quan, hieu qua
canh doanh » hanh doanh, chinh doanh, doanh doanh
doanh luan » doanh nhan
thong cong » tong cong, thong thong, phong chong
van phan » van phong, van thanh, luan phan
phan dau » phan tu, hang dau

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: hoc ((thieu sang) OR (hieu quang)) - canh doanh luan ((thong cong) OR (trong cong)) van phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (hieu quang)) - canh doanh luan ((thong cong) OR (trong cong)) van phan dau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (hieu quang)) - canh doanh luan ((thong cong) OR (trong cong)) van phan dau*.