Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
ban thanh » ban hanh, ban hang
dang mai » dang mau, dang bai, dang mam
dang hai » dang khai, hang hai, dung hai
tu sach » thu sach, su sach, te sach
dua ban » dia ban, cua ban, qua ban
cua tre » cuu tre, cua triet, dua tren
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
ca dua » cay dua, ca cua, ca da
cua te » cua tu
va ca » va cac, va cao, va cai

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 ((dang mai) or (dang hai)) hoa. hieu va ca dua ban thanh toan ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang mai) OR (dang hai)) hoa. hieu va ca dua ban thanh toan ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((dang mai) or (dang hai)) hoa. hieu va ca dua ban thanh toan ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang mai) or (dang hai)) hoa. hieu va ca dua ban thanh toan ((cua tre) OR (cua te))*.