Perhaps you should try some spelling variations:
te sach » toc sach
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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: ((te sach) OR (so sach)) ky nang o hoi. hieu ve cam ((duc ban) OR (cua ban)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sach)) ky nang o hoi. hieu ve cam ((duc ban) or (cua ban)) hanh vi cua tre*.