Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
cua tre » cuu tre, cua triet, dua tren
sach vu » sach va, sach tu, sach uu
va hanh » van hanh, va thanh, va danh
cua te » cua tu
xuc va » duc va, tuc va, luc va
va dao » ca dao
va cao » va cac, va co, va bao

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: hoc sach vu nang xa hoi. hieu ((va cao) OR (va dao)) xuc va hanh vi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach vu nang xa hoi. hieu ((va cao) OR (va dao)) xuc va hanh vi ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: hoc sach vu nang xa hoi. hieu ((va cao) OR (va dao)) xuc va hanh vi ((cua tre) or (cua te))*.