Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban doanh » van doanh, san doanh, ban danh
doanh de » doanh dao, doanh ket, doanh va
quoc ban » quoc bao, quoc lan, quoc quan
cam quoc » cac quoc, cao quoc, nam quoc
nang co » nang cao, nang doc, nang noi
hieu va » lieu va
de cua » le cua, te cua, dieu cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
nang o » nang ho, nang ro, nang x

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 o) OR (nang co)) hoi. ((hieu va) OR (hieu qua)) cam quoc ban doanh de cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang o) OR (nang co)) hoi. ((hieu va) or (hieu qua)) cam quoc ban doanh de cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang o) OR (nang co)) hoi. ((hieu va) or (hieu qua)) cam quoc ban doanh de cua triet*.