Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
tranh cua » doanh cua, manh cua
cua dung » cua dang, cua dong, qua dung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
han tap » han tai, toan tap, nhan tai

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

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