Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doanh va, doanh ban, doanh nhan
doan van » doan va, hoang van, luan van
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 sac » tu sach, tu cac, tu san
sac ky » cac ky, sai 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 sac ky ((nang xa) OR (lang xa)) hoi. hieu va giao duc va ((doanh van) OR (doan van)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (lang xa)) hoi. hieu va giao duc va ((doanh van) OR (doan van)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (lang xa)) hoi. hieu va giao duc va ((doanh van) OR (doan van)) cua triet*.