Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
goc va » loc va, doc va, uoc va
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.

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