Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
cua nhung » va nhung
cong van » cong vang, cong san, song van
van tuan » van quan, van ban, anh tuan
cua dan » cua dang, ca dan
tuan cu » tuan tu, quan cua, tuan thu

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 hanh - hanh tang ((((cua dan) OR (cua ban))) OR (cua nhung)) cong van tuan cu~.
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh tang ((((cua dan) or (cua ban))) or (cua nhung)) cong van tuan cu*.