Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
te sach » toc sach
van dau » van dao, phan dau
dau duc » dao duc, dang duc, dau nuoc
cua tre » cua te, cuu tre, cua triet
hang x » nang x, hoang xa, chang xu
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 thi hang x hoi. hieu van dau duc ((va thanh) or (ban thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi hang x hoi. hieu van dau duc ((va thanh) OR (ban thanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach thi hang x hoi. hieu van dau duc ((va thanh) or (ban thanh)) dai cua tre*.