Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
tranh luan » trinh luan, trinh luat, doanh luan
nhung cong » dung cong, thong cong, nhung don
hang cong » dang cong, hang nong, bang cong
van tang » van thang, van trang, van nang
tang van » dang van, hoang van, trong van

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: ho ((chieu sang) OR (chieu sach)) - canh tranh luan ((nhung cong) OR (hang cong)) van tang van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (chieu sach)) - canh tranh luan ((nhung cong) OR (hang cong)) van tang van~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chieu sach)) - canh tranh luan ((nhung cong) OR (hang cong)) van tang van*.