Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
su triet » su viet, ve triet
thanh vi » thanh va, thanh ve, nhanh vi
thuc day » thuc dan, thuc vat
thu sach » tu sach, thuat sach, thuoc sach
va pham » van pham, va phat, va phap
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
su tien » su kien, su hien, tu tieng

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 sang ma hoa. lieu va pham thuc day ((thanh vi) or (hanh vi)) ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky sang ma hoa. lieu va pham thuc day ((thanh vi) OR (hanh vi)) ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky sang ma hoa. lieu va pham thuc day ((thanh vi) or (hanh vi)) ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky sang ma hoa. lieu va pham thuc day ((thanh vi) or (hanh vi)) ((su triet) OR (su tien))*.