Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
loc va » luc va
vi cua » vai cua, di cua
x hoi » xa hoi, x ho, 5 hoi
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: thu sach y nang ((x hoi) OR (o hoi)). lieu va chat ((hoc va) OR (loc va)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((x hoi) OR (o hoi)). lieu va chat ((hoc va) or (loc va)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((x hoi) OR (o hoi)). lieu va chat ((hoc va) or (loc va)) hanh vi cua tre*.