Perhaps you should try some spelling variations:
thanh doanh » hanh doanh, thanh toan, chinh doanh
doanh cuu » doanh cua, doanh chu, doanh chau
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach kem
day ban » tay ban, da ban, day dan
sang ma » tang ma, nang ma, sang tao
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
cuu tre » cua tre, cau tren, cau treo
van ca » van cau, van cua, dan ca
ca day » cam day, ca dao, ca dan

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