Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau thuc » cau truc, cuu thuc, can thuc
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
y sang » _ sang, duy sang
ma hoi » xa hoi, ma hoa, me hoi
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: tu sach y sang ((ma hoi) OR (mai hoi)). ((hieu ve) OR (hieu qua)) cau thuc vat hanh vi cua triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach y sang ((ma hoi) or (mai hoi)). ((hieu ve) or (hieu qua)) cau thuc vat hanh vi cua triet*.