Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
tu cach » tu cac
hanh di » hanh vi, hanh de, hang di
soc van » hoc van, oc van, sac van
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sanh » do sanh
di cua » dai cua, doi cua, de 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) or (so sanh)) ky lang xa hoi. ((hieu ve) or (hieu van)) cham soc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sanh)) ky lang xa hoi. ((hieu ve) OR (hieu van)) cham soc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sanh)) ky lang xa hoi. ((hieu ve) or (hieu van)) cham soc van hanh di cua tre*.