Perhaps you should try some spelling variations:
doanh quan » doanh quang, doanh luan, doan quan
van doanh » toan doanh, van dong, van thanh
dang van » hoang van, hang va
tu sach » thu sach, su sach, te sach
cac dac » cac dan, cac dai, cac bac
cua tre » cuu tre, cua triet, dua tren
dac van » cac van, dao van, dam van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, dang xay
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 ((mang xa) OR (dang van)) hoi. hieu va cac dac van doanh quan ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((mang xa) or (dang van)) hoi. hieu va cac dac van doanh quan ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang xa) or (dang van)) hoi. hieu va cac dac van doanh quan ((cua tre) OR (cua te))*.