Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
hieu lang » chieu sang, hieu quang, nhieu tang
doanh cua » doanh luan
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
toc hieu » toc thieu, doc hieu, hoc thieu
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu lang - hanh doanh cua ((hang cong) OR (bang cong)) dan ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc hieu lang - hanh doanh cua ((hang cong) OR (bang cong)) dan ((toan tap) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: toc hieu lang - hanh doanh cua ((hang cong) OR (bang cong)) dan ((toan tap) or (toan ban))*.