Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu cach » tu cac
cach tu » cach thuc
hanh va » hang va, hanh vi
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
xay hoi » tay hoi, cay phoi, gay thoi
tu dang » thu dang, tu dong, su dang
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) OR (va 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) OR (va cham)) le van hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach tu dang ((xay hoi) or (xa hoi)). hieu ((ve cham) OR (va 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) OR (va cham)) le van hanh va cua tre*.