Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cao hoi » cau hoi, co hoi, cao hoc
luc ban » cuc ban, luc bat, luc van
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

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 y nang cao hoi. hieu van nam ((luc ban) OR (duc ban)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang cao hoi. hieu van nam ((luc ban) OR (duc ban)) hanh vi cua tre*.