Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
nang ma » sang ma, nang cao, mang may
cac loc » cac lop, cac toc, cac hoc
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
loc va » hoc va, luc va
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 ma) OR (tang ma)) hoi. hieu va cac loc 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 ma) OR (tang ma)) hoi. hieu va cac loc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (tu ban)) ky ((nang ma) OR (tang ma)) hoi. hieu va cac loc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (tu ban)) ky ((nang ma) OR (tang ma)) hoi. hieu va cac loc va hanh vai cua tre*.