Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh dat » tinh da, dinh dat, tinh dau
hieu ve » hieu va, hieu van
va tinh » may tinh
dat cua » dai cua, day cua, mat cua
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
cua te » cua tu
du va » dau va, tu va, su 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: toc sach ((y nang) OR (v nang)) ma hoi. hieu ve cac du va tinh dat cua te~.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (v nang)) ma hoi. hieu ve cac du va tinh dat cua te*.