Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
doanh luan » doanh nhan
luan phung » luan phuong, luan chung, luan phong
phung cong » nhung cong, phong cong, nhung chong
toc hieu » doc hieu, hoc thieu, thuc hieu
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc hieu) OR (toc thieu)) manh - hanh doanh luan phung cong ((dan than) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc hieu) OR (toc thieu)) manh - hanh doanh luan phung cong ((dan than) OR (van toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc hieu) OR (toc thieu)) manh - hanh doanh luan phung cong ((dan than) or (van toan)) cao".
• Adding a wildcard symbol may retrieve word variants: ((toc hieu) OR (toc thieu)) manh - hanh doanh luan phung cong ((dan than) or (van toan)) cao*.