Perhaps you should try some spelling variations:
thanh duong » thanh huong, thanh cuong, thanh vuong
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh dung » thanh tung, thanh hung, hanh dung
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
cua nhung » va nhung
cong san » cong tac
san van » tan van, luan van, tran van
van cau » van dau, van hau, van chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu lang) or (chieu sang)) - ((thanh dung) OR (thanh duong)) cua nhung cong san van cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu lang) OR (chieu sang)) - ((thanh dung) OR (thanh duong)) cua nhung cong san van cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu lang) or (chieu sang)) - ((thanh dung) OR (thanh duong)) cua nhung cong san van cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) or (chieu sang)) - ((thanh dung) OR (thanh duong)) cua nhung cong san van cau*.