Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu cach » tu cac
cach tu » cach thuc
tu dang » thu dang, tu dong, su dang
xay hoi » tay hoi, cay phoi, gay thoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cham le » pham le, cham den, cham lai
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach tu dang ((xay hoi) or (xa hoi)). hieu ve cham le van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu dang ((xay hoi) OR (xa hoi)). hieu ve cham le van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cach tu dang ((xay hoi) or (xa hoi)). hieu ve cham le van hanh va cua tre*.