Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
trong tan » trong quan, trong cac, trong ca
cua dung » cua dang, cua dong, qua dung
tong tap » tuong tac, cong tac, tong hop
toan cau » toan cao, toan ban, toan tap

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 cua dung ((trong tan) OR (tong tap)) toan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh tranh cua dung ((trong tan) or (tong tap)) toan cau*.