Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
cua trung » cua truong, xuan trung, cua nhung
hanh ban » thanh ban, hang ban, hanh san
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cap » khan cap, thanh lap, thanh cac
ban cua » ban quan

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ban cua trung ((cong dan) OR (cong san)) than cap~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ban cua trung ((cong dan) OR (cong san)) than cap*.