Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tranh » hanh trinh, hanh trang, lanh tranh
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua nhung » va nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
tan than » tan thanh, tan tran, tam than
ban than » ban thanh, van thanh, ban hang

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) OR (canh tranh)) cua nhung cong ((tan than) OR (ban than)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hanh tranh) OR (canh tranh)) cua nhung cong ((tan than) or (ban than)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh tranh) OR (canh tranh)) cua nhung cong ((tan than) or (ban than)) cao*.