Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
hien xanh » hien hanh, hien nhanh, chieu xanh
cua trung » cua truong, xuan trung, cua nhung
thanh cac » hanh cac, thanh bac, thanh ca
cong dan » cong san, cong tan, cong dong

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) OR (hanh trinh)) cua trung ((cong dan) OR (huong dan)) thanh cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((hanh tranh) OR (hanh trinh)) cua trung ((cong dan) or (huong dan)) thanh cac~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh tranh) OR (hanh trinh)) cua trung ((cong dan) or (huong dan)) thanh cac*.