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, hieu ve
va thanh » gia thanh, va tinh, le thanh
te sach » toc sach
cac duc » cac du, cao duc, cac dac
tai cua » thai cua, tai cuc, tri cua
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi hang x hoi. ((hieu van) OR (lieu va)) cac duc ((va thanh) OR (ban thanh)) tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi hang x hoi. ((hieu van) or (lieu va)) cac duc ((va thanh) OR (ban thanh)) tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach thi hang x hoi. ((hieu van) or (lieu va)) cac duc ((va thanh) OR (ban thanh)) tai cua tre*.