Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
xuc ban » duc ban, cuc ban, quoc ban
van cam » van nam, van lam, van cau
ly hang » ly quang
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ((ly hang) or (ty xang)) xa hoi. hieu van cam xuc ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ly hang) OR (ty xang)) xa hoi. hieu van cam xuc ban thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((ly hang) or (ty xang)) xa hoi. hieu van cam xuc ban thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((ly hang) or (ty xang)) xa hoi. hieu van cam xuc ban thanh di cua tre*.