Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
cua triet » cua viet, va triet
thu sach » tu sach, thuat sach, thuoc sach
qua cham » qua hai, qua cac, va cham
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ma hoa. hieu qua cham thuc day hanh vi ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ma hoa. hieu qua cham thuc day hanh vi ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ma hoa. hieu qua cham thuc day hanh vi ((cua triet) or (su triet))*.