Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu va » lieu va, hieu qua
cac lop » cac hop, cac loai
cua tre » cuu tre, cua triet, dua tren
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
lop va » lap va, hop va, nop va
tu san » thu san, tu can, vu san
ma hoi » mai hoi, xa hoi, ma hoa
tu ban » thu ban, te ban
cua te » cua tu

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