Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hanh vai » hanh vi, hanh va, hanh tai
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cac lop » cac loai
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu can, vu san
tu ban » thu ban, te ban

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

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