Perhaps you should try some spelling variations:
escuela natural » escuela material, escuela rural, escuela actual
del pianoforte » de pianoforte, der pianoforte, per pianoforte
di escuela » de escuela, ii escuela, de escuelas
natural 6 » natural y, natural 2, natural 3
6 canto » y canto, v canto, el canto
pezzi » pozzi
celebri » celebre, celebra, celebro

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "Biblioteca lirica : pezzi celebri di escuela natural 6 canto ((del pianoforte) OR (e pianoforte)).~".
• Adding a wildcard symbol may retrieve word variants: Biblioteca lirica : pezzi celebri di escuela natural 6 canto ((del pianoforte) OR (e pianoforte)).*.