Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
canh manh » lanh manh, canh tranh, cach mang
cua nhung » va nhung
manh cua » doanh cua, ban cua
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 quang - canh manh cua nhung ((cong tac) or (cong tan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quang - canh manh cua nhung ((cong tac) OR (cong tan)) van ban.
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - canh manh cua nhung ((cong tac) or (cong tan)) van ban*.