Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
cham duc » pham duc, cham soc, pham duy
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
duc ban » duc tan, duc van, dua ban
ve cham » va cham, ve chat, vu cham
sang ky » sang kyo, dang ky, tang ky
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi

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

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