Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac
cac bo » bac bo, cac co
bo van » vo van, so van, do van

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang ((ma hoi) or (xa hoi)). hieu ve cac bo van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang ((ma hoi) OR (xa hoi)). hieu ve cac bo van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang ((ma hoi) or (xa hoi)). hieu ve cac bo van hanh vai cua tre*.