Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
hoc dieu » hoc thieu, hoc hien
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 dieu hanh - hanh tranh cua nhung cong ((tan than) OR (ban than)) cao~.
• Adding a wildcard symbol may retrieve word variants: hoc dieu hanh - hanh tranh cua nhung cong ((tan than) or (ban than)) cao*.