Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
nang tai » hang tai, sang tai, nang cao
hanh vai » hanh vi, hanh va, hanh tai
tang tai » hang tai, dung tai, sang tao
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
sanh ky » hanh ky, sang ky, nganh ky
xuc va » duc va, tuc va, luc va

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

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