Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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: doc hieu xanh - hanh tranh cua ((nhung cong) OR (hang cong)) dan than cau~.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh tranh cua ((nhung cong) or (hang cong)) dan than cau*.