Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cay dua » chay dua, cay lua, cay nua
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
ky sang » ky dang, ky tang, duy sang
ca dua » ca cua, ca da, ca lua

You may be able to get more results by adjusting your search query.

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