Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
qua cham » qua hai, qua cac, va cham
lang xa » lang ha, lang van
truc va » thuc va, thuc vat, trung va
can ky » van ky, dan ky, ban ky
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
tu can » tu ban, tu cac, thu canh

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 can ky ((lang xa) OR (dang xay)) hoi. hieu qua cham ((luc va) OR (truc va)) hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky ((lang xa) OR (dang xay)) hoi. hieu qua cham ((luc va) or (truc va)) hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu can ky ((lang xa) OR (dang xay)) hoi. hieu qua cham ((luc va) or (truc va)) hanh vi cua triet*.