Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
cach dua » cach cua, cach dung, cac du
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
hang do » hang doi, dang do, hang di
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
cac dua » cac qua, cac du, ca dua
sach ty » sach y, sach tu, sach thu
cua te » cua tu
do hoi » do choi, do hoai, do thoi

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 ty hang do hoi. hieu ve ((cac dua) OR (cach dua)) ban doanh tai ((cuu tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang do hoi. hieu ve ((cac dua) OR (cach dua)) ban doanh tai ((cuu tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hang do hoi. hieu ve ((cac dua) OR (cach dua)) ban doanh tai ((cuu tre) or (cua te))*".