Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cua triet » cua viet, su triet, va triet
va doanh » van doanh, vay doanh, va danh
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
van cua » vang cua, ban cua, dan cua
tu sai » tu bai, tu san, tu lai
tu cai » tu cac, tu can, tu bai

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