Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
tranh cua » doanh cua, manh cua
doc hieu » toc thieu, hoc thieu, hoc hien
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (doi chi)) xanh - hanh tranh cua ((nhung cong) or (thong cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (doi chi)) xanh - hanh tranh cua ((nhung cong) OR (thong cong)) tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (doi chi)) xanh - hanh tranh cua ((nhung cong) or (thong cong)) tac toan cau*.