Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hieu manh » chieu xanh, hieu nganh, dieu hanh
soanh cua » manh cua, tranh cua, sinh cua
doanh cua » doanh luan
hoc hieu » hoc thieu, hoc hien, doc hieu
cong san » cong tac
chan dau » phan dau, han dau, chuan dao
doanh » danh, toanh, soanh
doan » dan, toan, soan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - canh ((soanh cua) OR (doanh cua)) thuong cong san ((chan dau) or (chan doan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh ((soanh cua) OR (doanh cua)) thuong cong san ((chan dau) OR (chan doan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh ((soanh cua) OR (doanh cua)) thuong cong san ((chan dau) or (chan doan))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh ((soanh cua) OR (doanh cua)) thuong cong san ((chan dau) or (chan doan))*.