Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hien xanh » hien hanh, hien nhanh, chieu xanh
cong cong » cong dong, trong cong, dung cong
manh toan » thanh toan, anh tuan, tinh toan
tranh va » tranh van, trang va, trinh va
dan than » dan chan, ban than, van than
va cong » tai cong, cua cong

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 hien xanh - hanh tranh va cong cong ((((xuan toan) OR (dan than))) OR (manh toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh tranh va cong cong ((((xuan toan) or (dan than))) or (manh toan)) cau*.