Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » su sach, te sach, tu cach
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
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) or (tu sach)) y nang o hoi. lieu va cham ((goc va) or (hoc va)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y nang o hoi. lieu va cham ((goc va) OR (hoc va)) hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) y nang o hoi. lieu va cham ((goc va) or (hoc va)) hanh dai cua tre*.