Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh manh » hanh mang, lanh manh, hoang manh
cong vang » cong quang, cong ngang, cong san
cong lang » cong luong, cong quang, cong ngang
thanh chu » thanh chau, thanh cha, thanh thu
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung

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 lang - hanh manh cua dung ((cong vang) OR (cong lang)) ((thanh pho) OR (thanh chu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - hanh manh cua dung ((cong vang) OR (cong lang)) ((thanh pho) or (thanh chu))~".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh manh cua dung ((cong vang) OR (cong lang)) ((thanh pho) or (thanh chu))*.