Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
tinh dat » tinh da, dinh dat, tinh dau
ly nang » ky nang, ly hang, ly vang
van cac » van hac, van cau, van bac
cac dac » cac dan, cac dai, cac bac
va tinh » may tinh
dat huu » dao huu, dai huu, dat hua
huu tre » huu tri, cuu tre, huu them
y nang » ky nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
dac va » duc va, day va, dat 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 (ly nang)) ma hoi. hieu van cac dac va tinh dat huu tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (ly nang)) ma hoi. hieu van cac dac va tinh dat huu tre*.