Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
thi hang » thi hanh, thi nang, thi hong
hieu van » hieu va, thien van, lieu va
thanh di » thanh de, thanh do, thanh dinh
sach thi » sach thu, sach tai, sach thieu
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
cau luc » cau truc, cau phuc
cac luc » coc luc, cac nuoc, cac cuoc
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 ((cac luc) OR (cau luc)) gia ((thanh di) or (thanh doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi hang x hoi. hieu van ((cac luc) OR (cau luc)) gia ((thanh di) OR (thanh doi)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi hang x hoi. hieu van ((cac luc) OR (cau luc)) gia ((thanh di) or (thanh doi)) cua tre*".