Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham thuc » nham thuc, pham thuc, tham thuc
nang dai » nang dau, nang tai, lang dai
qua cham » qua hai, qua cac, va cham
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
dai hoi » dai hoc, dai hai, dai moi
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang

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) OR (co sach)) y nang dai hoi. hieu qua cham thuc day hanh vi ((cua triet) OR (su tien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) y nang dai hoi. hieu qua cham thuc day hanh vi ((cua triet) or (su tien))~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) y nang dai hoi. hieu qua cham thuc day hanh vi ((cua triet) or (su tien))*.