Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
lang hoa » hang hoa, lang ha, nang hoa
su triet » su viet, ve triet
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, dia danh
su tien » su kien, su hien, tu tieng
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, ban hanh
hieu ha » hieu hoa, hieu va, hieu ca
ky lang » ky nang, ky dang, ky tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang hoa hoc. hieu ha nam thuoc ((va hanh) OR (va danh)) ve ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang hoa hoc. hieu ha nam thuoc ((va hanh) OR (va danh)) ve ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang hoa hoc. hieu ha nam thuoc ((va hanh) OR (va danh)) ve ((su triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang hoa hoc. hieu ha nam thuoc ((va hanh) OR (va danh)) ve ((su triet) or (su tien))*.