Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cac xuc » cam xuc, cac nuoc, chat xuc
mai hoi » mai khoi, dai hoi, lai hoi
bai ky » ban ky, sai ky, bac ky
ma hoi » xa hoi, ma hoa, me hoi
ca cua » co cua
tu bai » tu ban, tu bat, te bai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky nang ((ma hoi) or (mai hoi)). hieu cua cac xuc ((va danh) or (va hanh)) ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky nang ((ma hoi) OR (mai hoi)). hieu cua cac xuc ((va danh) OR (va hanh)) ca cua tre.
• Adding a wildcard symbol may retrieve word variants: tu bai ky nang ((ma hoi) or (mai hoi)). hieu cua cac xuc ((va danh) or (va hanh)) ca cua tre*.