Perhaps you should try some spelling variations:
sang tao » hang tai
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, mang may
thi van » thi lan, thi hanh, thi nang
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky ((sang ma) OR (sang tao)) hoi. thi van nam thuc va hanh di su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((sang ma) OR (sang tao)) hoi. thi van nam thuc va hanh di su triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((sang ma) OR (sang tao)) hoi. thi van nam thuc va hanh di su triet*.