Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
hoc thieu » toc thieu, hoc hien
doanh cua » doanh luan
tang luan » dung luan
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap

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 khang - hanh ((doanh cua) OR (tang luan)) nhung ((cong ban) OR (cong tan)) than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu khang - hanh ((doanh cua) or (tang luan)) nhung ((cong ban) OR (cong tan)) than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu khang - hanh ((doanh cua) or (tang luan)) nhung ((cong ban) OR (cong tan)) than cau*.