Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
hieu van » hieu va, lieu va, hieu ve
cac thuc » cach thuc, cac thu, can thuc
doan van » doan va, hoang van, luan van
thuc va » thuc vat, thuc dan, thuc day
va doan » va doanh, van doan, va dan
van cua » vang cua, ban cua, dan cua
te cac » tu cac, ve cac, te cao
ma hoi » mai hoi, ma hoa, me hoi

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: te cac ky nang ((ma hoi) OR (xa hoi)). ((hieu van) OR (thien van)) cac thuc va doan van cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky nang ((ma hoi) or (xa hoi)). ((hieu van) OR (thien van)) cac thuc va doan van cua triet~".
• Adding a wildcard symbol may retrieve word variants: te cac ky nang ((ma hoi) or (xa hoi)). ((hieu van) OR (thien van)) cac thuc va doan van cua triet*.