Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
doanh luan » doanh nhan
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
phan cau » phan cac, phan tu, phan lap
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)) nhung cong tan ((phan cau) OR (phan dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - canh ((doanh cua) OR (doanh luan)) nhung cong tan ((phan cau) or (phan dau))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh ((doanh cua) OR (doanh luan)) nhung cong tan ((phan cau) or (phan dau))*.