Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cua tre » cua te, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
cuu tre » cau tren, cau treo
va cham » va chat, va tham
goc va » loc va, doc va, uoc va
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang o hoi. lieu va cham ((goc va) or (hoc va)) hanh di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang o hoi. lieu va cham ((goc va) OR (hoc va)) hanh di ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach y nang o hoi. lieu va cham ((goc va) or (hoc va)) hanh di ((cua tre) or (cuu tre))*.