Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
hanh doanh » hang doanh, chinh doanh, kinh doanh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
tan van » tran van, tang van, luan 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 xanh - ((hanh doanh) OR (doanh doanh)) cua ((nhung cong) or (thong cong)) tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((hanh doanh) OR (doanh doanh)) cua ((nhung cong) OR (thong cong)) tan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - ((hanh doanh) OR (doanh doanh)) cua ((nhung cong) or (thong cong)) tan van ban".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((hanh doanh) OR (doanh doanh)) cua ((nhung cong) or (thong cong)) tan van ban*.