Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu cach » tu cac
cham le » pham le, cham den, cham lai
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cach su » cach tu, hoach su
xay hoi » tay hoi, cay phoi, gay thoi
su dang » su dung

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 su dang ((xay hoi) or (xa hoi)). hieu ve cham le van hanh ((vai cua) OR (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach su dang ((xay hoi) OR (xa hoi)). hieu ve cham le van hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach su dang ((xay hoi) or (xa hoi)). hieu ve cham le van hanh ((vai cua) OR (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu cach su dang ((xay hoi) or (xa hoi)). hieu ve cham le van hanh ((vai cua) OR (hai cua)) tre*.