Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
ban hanh » ban hang
hieu van » thien van, lieu va, hieu ve
cam luc » cam xuc, cau luc
con cua » cong cua, co cua, dong cua
sach va » sach xa, sach ha, sach dao
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach va nang xa hoi. ((hieu va) or (hieu van)) cam luc ((ban hanh) or (va thanh)) con cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach va nang xa hoi. ((hieu va) OR (hieu van)) cam luc ((ban hanh) OR (va thanh)) con cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach va nang xa hoi. ((hieu va) or (hieu van)) cam luc ((ban hanh) or (va thanh)) con cua tre*.