Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
tong cong » trong cong, cong cong, dung cong
tan toan » tan tran, tap toan, van toan
tap doan » tap quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - hanh tranh cua ((nhung cong) or (tong cong)) ((tan toan) or (tap doan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh tranh cua ((nhung cong) OR (tong cong)) ((tan toan) OR (tap doan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh tranh cua ((nhung cong) or (tong cong)) ((tan toan) or (tap doan)) cau*.