Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va dao » ca dao
va dat » va dau, va dap, va dai
cua te » cua tu
sach v » sach va, sach y, sach 2
va cao » va cac, va bao
v nang » va nang, vu nang, van nang
va co » vo co
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((va cao) OR (va co)) tuc ((va dat) OR (va dao)) dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang x hoi. hieu ((va cao) or (va co)) tuc ((va dat) OR (va dao)) dai cua te~".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang x hoi. hieu ((va cao) or (va co)) tuc ((va dat) OR (va dao)) dai cua te*.