Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
thanh di » thanh doi, thanh de, thanh do
te sach » toc sach
so sach » so sanh, bo sach, co sach
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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 (so sach)) ky nang x hoi. hieu van pham duc ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sach)) ky nang x hoi. hieu van pham duc ban thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sach)) ky nang x hoi. hieu van pham duc ban thanh di cua tre*.