Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh va, hanh tai, hanh van
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu can, vu san
tu ban » thu ban, te ban
luc va » duc va, tuc va, loc va

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 x ho. hieu van cam luc va ((hanh vai) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (tu ban)) ky nang x ho. hieu van cam luc va ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (tu ban)) ky nang x ho. hieu van cam luc va ((hanh vai) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (tu ban)) ky nang x ho. hieu van cam luc va ((hanh vai) OR (hanh vi)) cua tre*.