Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tuong dan » huong dan, tung dan, truong dai
xuong dan » huong dan, xuong san, nguong dan
dung dan » dung dat, dung san, tung dan
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 - canh tranh cua nhung ((((tuong dan) OR (xuong dan))) OR (dung dan)) toan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh tranh cua nhung ((((tuong dan) or (xuong dan))) or (dung dan)) toan cau*.