Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
trung va » truong va, trang va, trung ha
truc va » thuc va, thuc vat
so sach » so sanh, bo sach, co sach
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
qua cam » qua cham, qua cac, qua ca
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

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: so sach y nang ((mai hoi) OR (lai hoi)). hieu qua cam ((truc va) OR (trung va)) hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ((mai hoi) OR (lai hoi)). hieu qua cam ((truc va) or (trung va)) hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((mai hoi) OR (lai hoi)). hieu qua cam ((truc va) or (trung va)) hanh vi cua triet*.