Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hoi » thanh hoai, thanh hoa, thanh hai
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
ky sang » ky dang, ky tang, duy sang
hieu va » lieu va, hieu qua
dua ban » dia ban, cua ban, qua ban
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
ca dua » cay dua, ca cua, ca da

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 ((ky sang) or (ky nang)) ma hoa. ((hieu van) OR (hieu va)) ca dua ban thanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky sang) OR (ky nang)) ma hoa. ((hieu van) OR (hieu va)) ca dua ban thanh hoi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky sang) or (ky nang)) ma hoa. ((hieu van) OR (hieu va)) ca dua ban thanh hoi cua tre*".