Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
quoc ban » quoc bao, quoc lan, quoc quan
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu van
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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 sang ma hoi. ((hieu ve) OR (hieu va)) cham ((cua ban) OR (quoc ban)) hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ma hoi. ((hieu ve) OR (hieu va)) cham ((cua ban) or (quoc ban)) hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ma hoi. ((hieu ve) OR (hieu va)) cham ((cua ban) or (quoc ban)) hanh vi cua triet*.