Perhaps you should try some spelling variations:
doanh bao » doanh bat, doanh ban, doanh bac
doanh cao » doanh co, doanh cho, doanh dao
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
van cac » van hac, van bac, dan cac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
toc ta » toc tay, toc thai
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: te sach ky lang xa hoi. hieu ((van cac) OR (van cau)) toc ta ((doanh cao) OR (doanh bao)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu ((van cac) or (van cau)) toc ta ((doanh cao) OR (doanh bao)) cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu ((van cac) or (van cau)) toc ta ((doanh cao) OR (doanh bao)) cua te*.