Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
doanh va » doan va, doanh tai, doanh cua
tang van » hoang van, trong van, tang luan
dang van » hoang van, hang va
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu manh - hanh doanh va dung cong ((tang van) or (dang van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh doanh va dung cong ((tang van) OR (dang van)) ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - hanh doanh va dung cong ((tang van) or (dang van)) ban*.