Perhaps you should try some spelling variations:
sach tranh » canh tranh
doanh tren » doanh tien, doanh trong, dinh tren
tranh tien » thanh tien, tran tien, trinh tien
cac doanh » cac dan, cac dang, van doanh
cao dinh » cao minh, co dinh, dao dinh
dinh tri » chinh tri
toc sach » hoc sach, doc sach, thuoc sach

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: (((( hoc cao dinh tri ) OR ( hoc cac doanh tren ))) OR ( toc sach tranh tien ))~.
• Adding a wildcard symbol may retrieve word variants: (((( hoc cao dinh tri ) or ( hoc cac doanh tren ))) or ( toc sach tranh tien ))*.