Perhaps you should try some spelling variations:
teatrali perez » teatrali per
per pianoforte » e pianoforte, de pianoforte
pozzi celebri » pezzi celebri
perez galdos » perez carlos
y espera » y esfera, la espera, de espera
y opera » _ opera, la opera

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 : pozzi celebri ((y opera) OR (y espera)) teatrali perez galdos per pianoforte.~".
• Adding a wildcard symbol may retrieve word variants: Biblioteca lirica : pozzi celebri ((y opera) OR (y espera)) teatrali perez galdos per pianoforte.*.