Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dan doi » dan hoi, dan toi, van doi
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
y nang » ky nang, ly nang, may nang
ca dan » cac dan, ca dao

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)) xa hoi. hieu van ((cham soc) OR (cham o)) ca dan doi cua tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (v nang)) xa hoi. hieu van ((cham soc) or (cham o)) ca dan doi cua tre*.