Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh nhan, doanh luan
doanh van » doan van, doanh va, doanh nhan
cua triet » cua viet, su triet, va triet
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
tu sai » tu bai, tu san, tu cai
sai ky » sac ky

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 sai ky ((nang xa) OR (lang xa)) hoi. hieu va giao duc va ((doanh van) OR (doanh ban)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((nang xa) or (lang xa)) hoi. hieu va giao duc va ((doanh van) OR (doanh ban)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang xa) or (lang xa)) hoi. hieu va giao duc va ((doanh van) OR (doanh ban)) cua triet*.