Perhaps you should try some spelling variations:
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
ky van » ly van, ty van, ky va
va cao » va cac, va co, va dao
di cua » dai cua, doi cua, de 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 ky van xay hoi. hieu va cao duc ((va hanh) or (va dinh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky van xay hoi. hieu va cao duc ((va hanh) OR (va dinh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: so sanh ky van xay hoi. hieu va cao duc ((va hanh) or (va dinh)) di cua tre*.