Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va cua » va chua, via cua, ca cua

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