Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong tang » cong thang, cong lang, cong vang
cong tac » cong ty
cong tan » cong san, cong thanh, cong ty
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - canh tranh cua nhung ((cong tac) or (((cong tang) OR (cong tan)))) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh tranh cua nhung ((cong tac) OR (((cong tang) OR (cong tan)))) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh tranh cua nhung ((cong tac) or (((cong tang) OR (cong tan)))) van ban".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh tranh cua nhung ((cong tac) or (((cong tang) OR (cong tan)))) van ban*.