Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van nang » van quang, van ban, van dong
hanh lai » hanh lam, hanh tai, thanh lap
sach van » sach han, sach va, bach van
lai cua » dai cua, hai cua, lai chau
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
luc va » duc va, tuc va, loc va
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu
ac va » tac va, bac va, mac va

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 van nang ((ma hoi) OR (mai hoi)). hieu ve chat ((ac va) OR (luc va)) hanh lai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach van nang ((ma hoi) OR (mai hoi)). hieu ve chat ((ac va) or (luc va)) hanh lai cua te~".
• Adding a wildcard symbol may retrieve word variants: hoc sach van nang ((ma hoi) OR (mai hoi)). hieu ve chat ((ac va) or (luc va)) hanh lai cua te*.