Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thu sach » tu sach, thuat sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, mang may
qua cac » cua cac
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh

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) OR (nang cao)) hoa. hieu qua cac thuc va 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) OR (nang cao)) hoa. hieu qua cac thuc va hanh vi ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang ma) OR (nang cao)) hoa. hieu qua cac thuc va hanh vi ((cua triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang ma) OR (nang cao)) hoa. hieu qua cac thuc va hanh vi ((cua triet) or (su triet))*.