Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
hang nong » thang long, han tong
dang cong » dung cong
ban thanh » ban hanh, ban hang
hoc hieu » hoc thieu, hoc hien, doc hieu

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: hoc hieu manh - hanh tranh cua ((hang nong) OR (dang cong)) ((tan tran) OR (ban thanh)) cao~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh tranh cua ((hang nong) or (dang cong)) ((tan tran) or (ban thanh)) cao*.