Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
cam thuc » am thuc, nam thuc, cam thu
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, mang may
qua cam » qua cham, qua cac, qua ca

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