Perhaps you should try some spelling variations:
quan nhung » qua nhung, cua nhung, luan chung
hien xanh » hien hanh, hien nhanh, chieu xanh
canh ban » can ban, canh van, doanh ban
canh dan » canh van, sanh dan, thanh dan
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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 ban) OR (canh dan)) quan nhung ((cong dan) OR (cong tan)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((canh ban) or (canh dan)) quan nhung ((cong dan) OR (cong tan)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((canh ban) or (canh dan)) quan nhung ((cong dan) OR (cong tan)) toan cau*.