Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong sang » cong lang, cong vang, cong bang
doi hieu » doi chieu, doc hieu, hoi hieu
doi hien » doi dien, doi bien, doi kien
cong san » cong tac

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

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