Perhaps you should try some spelling variations:
del pianoforte » de pianoforte, der pianoforte, e pianoforte
pozzi celebri » pezzi celebri
opera teatral » opere teatrali
obra teatral » obras teatrales
valor del » valor de
e valor » de valor, el valor, en valor

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

• Performing a fuzzy search may retrieve terms with similar spellings: Biblioteca lirica : pozzi celebri di ((opera teatral) OR (obra teatral)) e valor del pianoforte.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "Biblioteca lirica : pozzi celebri di ((opera teatral) OR (obra teatral)) e valor del pianoforte.*".