Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
canh tinh » hanh tinh, manh tinh, canh tranh
van thanh » ban thanh, van tuan
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
ca cau » cua cau, cac cau, can cau

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 trinh) OR (canh tinh)) van thanh ((cong dan) OR (cong san)) ca cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((hanh trinh) or (canh tinh)) van thanh ((cong dan) OR (cong san)) ca cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh trinh) or (canh tinh)) van thanh ((cong dan) OR (cong san)) ca cau*.