Perhaps you should try some spelling variations:
cua phuong » cuu phuong, cuc phuong, luan phuong
hieu sang » chieu sang, hieu lang, hieu quang
thanh lap » thanh san, phan lap, thanh hai
doc hieu » toc thieu, hoc thieu, hoc hien
cua nong » cua cong, cuu nong, cua dong
cong san » cong tac
than cap » khan cap, thanh cac, than cua

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: doc hieu sang - canh tranh ((cua phuong) OR (cua nong)) cong san ((than cap) OR (thanh lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sang - canh tranh ((cua phuong) or (cua nong)) cong san ((than cap) OR (thanh lap))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - canh tranh ((cua phuong) or (cua nong)) cong san ((than cap) OR (thanh lap))*.