Perhaps you should try some spelling variations:
chinh doanh » kinh doanh
hanh doanh » hang doanh, doanh doanh, kinh doanh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
doc hieu » toc thieu, hoc thieu, hoc hien
tang van » dang van, hoang van, trong van

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) OR (chinh doanh)) tai ((nhung cong) or (thong cong)) tang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - ((hanh doanh) OR (chinh doanh)) tai ((nhung cong) OR (thong cong)) tang van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu manh - ((hanh doanh) OR (chinh doanh)) tai ((nhung cong) or (thong cong)) tang van ban".
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - ((hanh doanh) OR (chinh doanh)) tai ((nhung cong) or (thong cong)) tang van ban*.