Perhaps you should try some spelling variations:
so sanh » do sanh
soc van » hoc van, sac van, soc dan
sanh ty » sach ty, canh tay
hieu va » lieu va, hieu qua
va kham » va cham, va khao, va tham
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
oc van » hoc van, luoc van, quoc van
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ty ((nang cao) or (lang ha)) hoi. hieu va kham ((soc van) OR (oc van)) anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ty ((nang cao) OR (lang ha)) hoi. hieu va kham ((soc van) OR (oc van)) anh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ty ((nang cao) or (lang ha)) hoi. hieu va kham ((soc van) OR (oc van)) anh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ty ((nang cao) or (lang ha)) hoi. hieu va kham ((soc van) OR (oc van)) anh vi cua tre*.