Perhaps you should try some spelling variations:
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
anh tang » anh bang, anh dang, anh nang
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan ban » van ban
tang va » trang va, tang van, thang va

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) OR (hien hanh)) - anh tang va nhung ((cong dan) OR (cong tan)) toan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - anh tang va nhung ((cong dan) or (cong tan)) toan ban*.