Perhaps you should try some spelling variations:
doanh dan » doanh van, doanh dao, doanh doanh
doanh ban » doanh bat, doanh van, doanh nhan
tu sach » thu sach, su sach, te sach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cam xuc van ((doanh dan) OR (doanh ban)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) or (tang ma)) hoi. hieu ve cam xuc van ((doanh dan) OR (doanh ban)) cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (tang ma)) hoi. hieu ve cam xuc van ((doanh dan) OR (doanh ban)) cua te*.