Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu sang » chieu sang, tieu dung, tinh sang
tiem nang » tin nang, tich nang
dung cua » dung cho
cong san » cong tac
san than » sang than, san thanh, ban than
than cao » toan cao, thai cao, 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: theo ((tieu sang) OR (tiem nang)) - hanh ((dung cua) OR (dung luan)) nhung cong san than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sang) or (tiem nang)) - hanh ((dung cua) OR (dung luan)) nhung cong san than cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu sang) or (tiem nang)) - hanh ((dung cua) OR (dung luan)) nhung cong san than cao*.