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 tap » trong thap, tong tap, trong tai
trong tan » trong quan, trong ca, cong tan
cua dung » cua dang, cua dong, qua dung
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 tap) OR (((trong tan) OR (trong cac)))) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh tranh cua dung ((trong tap) or (((trong tan) OR (trong cac)))) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh tranh cua dung ((trong tap) or (((trong tan) OR (trong cac)))) toan cau*.