Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong thanh, cong ty
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 (hieu lang)) - canh tranh cua dung ((cong tan) or (cong san)) han tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu xanh) OR (hieu lang)) - canh tranh cua dung ((cong tan) OR (cong san)) han tap.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu xanh) or (hieu lang)) - canh tranh cua dung ((cong tan) or (cong san)) han tap*.