Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
dai cuu » dai cua, dai huu
dua ban » dia ban, cua ban, qua ban
cay dua » chay dua, cay lua, ca dua
van cay » van cau, van bay, van ca
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tang ma » tang van
sang ma » nang ma, sang tao, sang tai
cuu tre » cua tre, cau tren, cau treo

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