Perhaps you should try some spelling variations:
thien van » thi van
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
hieu van » hieu va, lieu va, hieu ve
dai cuu » dai cua, dai huu
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
cuu tre » cua tre, cau tren, cau treo
o hoc » co hoc, mo hoc, so hoc
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 ly hang ((x hoi) or (o hoc)). ((hieu van) or (thien van)) cac duc ban thanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly hang ((x hoi) OR (o hoc)). ((hieu van) OR (thien van)) cac duc ban thanh dai cuu tre*.