Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
chu xanh » chu manh, chieu xanh, chua xang
quan cao » quang cao, quan cau, juan cao
cho chu » cho thue
quan ao » quan so, quang cao, quang bao

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: cho chu xanh - hanh tranh cua ((nhung cong) OR (hang cong)) van ((quan cao) OR (quan ao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho chu xanh - hanh tranh cua ((nhung cong) or (hang cong)) van ((quan cao) OR (quan ao))~".
• Adding a wildcard symbol may retrieve word variants: cho chu xanh - hanh tranh cua ((nhung cong) or (hang cong)) van ((quan cao) OR (quan ao))*.