Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van hau » van ha, van hai, van dau
duc van » duc va, duc manh, duc phan
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, me hoi
de cua » le cua, te cua, dieu 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: toc sach v nang ((ma hoi) OR (ma hoa)). hieu van hau ((duc van) OR (duc tan)) hanh de cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang ((ma hoi) or (ma hoa)). hieu van hau ((duc van) OR (duc tan)) hanh de cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang ((ma hoi) or (ma hoa)). hieu van hau ((duc van) OR (duc tan)) hanh de cua tre*.