Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
nang dai » nang dau, nang tai, lang dai
qua cham » qua hai, qua cac, va cham
vat hanh » vat thanh, van hanh, va hanh
hanh vai » hanh vi, hanh va, hanh tai
cua viet » cua vat, cua dieu, va viet
so sach » so sanh, bo sach, co sach
dai hoi » dai hoc, dai hai, dai moi
ca viet » va viet, co viet, san viet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v nang dai hoi. hieu qua cham thuc vat hanh vai ((((cua viet) or (ca viet))) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang dai hoi. hieu qua cham thuc vat hanh vai ((((cua viet) OR (ca viet))) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: so sach v nang dai hoi. hieu qua cham thuc vat hanh vai ((((cua viet) or (ca viet))) or (hoa viet))*.