Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
cam loc » cam lo
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 cam » va cham, va cac, va cao
va dan » ca dan, va dao, va dap
va dau » va dao
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang x hoi. hieu va cam loc ((va dan) OR (va dau)) di cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang x hoi. hieu va cam loc ((va dan) OR (va dau)) di cua tre*.