Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va cao » va cac, va co, va dao
xuc va » tuc va, luc va, xac va
cua te » cua tu

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