Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
tai khoa » da khoa, noi khoa
hieu van » thien van, lieu va, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
so sanh » do sanh
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
sanh ky » hanh ky, sang ky, nganh ky
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va
loc va » hoc 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 khoa. ((hieu van) OR (hieu va)) cam ((luc va) OR (loc va)) hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky nang tai khoa. ((hieu van) or (hieu va)) cam ((luc va) OR (loc va)) hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang tai khoa. ((hieu van) or (hieu va)) cam ((luc va) OR (loc va)) hanh vai cua tre*.