Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
vat hanh » vat thanh, van hanh, va hanh
su triet » su viet, su tien, ve triet
van cau » van dau, van hau, van chat
cach v » cach _, cach 9, cach van
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, ma hoa, me hoi
cuoc » quoc, duoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: cuoc cach v nang ((ma hoi) or (xa hoi)). hieu van cau thuc vat hanh vi ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cuoc cach v nang ((ma hoi) OR (xa hoi)). hieu van cau thuc vat hanh vi ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: cuoc cach v nang ((ma hoi) or (xa hoi)). hieu van cau thuc vat hanh vi ((cua triet) or (su triet))*.