Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
cau thuc » cau truc, cuu thuc, can thuc
tu sach » thu sach, su sach, te sach
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
hieu ve » hieu va, hieu van
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 _ sang ((mai hoi) OR (dai hoi)). ((hieu ve) OR (hieu qua)) cau thuc day hanh vi cua triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach _ sang ((mai hoi) or (dai hoi)). ((hieu ve) or (hieu qua)) cau thuc day hanh vi cua triet*.