Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
doanh luan » doanh nhan
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
phan cac » nhan cach, phan lap, phan van
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 - canh ((doanh cua) OR (doanh luan)) dung cong tan ((phan cac) OR (phan dau))~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh ((doanh cua) or (doanh luan)) dung cong tan ((phan cac) or (phan dau))*.