Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu va » lieu va, hieu qua
va thai » van thai, va tai, va tham
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
son va » song va, son la, son ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ((ky lang) OR (ky tang)) xa hoi. hieu va thai ((son va) or (lon va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ((ky lang) OR (ky tang)) xa hoi. hieu va thai ((son va) OR (lon va)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ((ky lang) OR (ky tang)) xa hoi. hieu va thai ((son va) or (lon va)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ((ky lang) OR (ky tang)) xa hoi. hieu va thai ((son va) or (lon va)) hanh vai cua tre*.