Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, hang di
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
van cau » van dau, van hau, van chat
tuc va » truc va, tuc xa, duc va
ma hoi » xa hoi, ma hoa, me hoi
di cua » dai cua, doi cua, de 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 ky nang ((ma hoi) OR (mai hoi)). hieu van cau ((tuc va) OR (thuc va)) hanh di cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ((ma hoi) or (mai hoi)). hieu van cau ((tuc va) OR (thuc va)) hanh di cua triet~".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((ma hoi) or (mai hoi)). hieu van cau ((tuc va) OR (thuc va)) hanh di cua triet*.