Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
cua tre » cua te, cuu tre, cua triet
cac loc » cac lop, cac toc, cac hoc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va, luc va
tu ban » thu ban, te ban
tu san » thu san, tu can, vu san

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 hoi. hieu va cac loc 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 ma hoi. hieu va cac loc 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 ma hoi. hieu va cac loc va ((hanh vai) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (tu ban)) ky nang ma hoi. hieu va cac loc va ((hanh vai) OR (hanh vi)) cua tre*.