Perhaps you should try some spelling variations:
pezzi celebro » pezzi celebri
de pianoforte » e pianoforte, per pianoforte
a documentos » y documentos, 1 documentos, 2 documentos
de pobreza » la pobreza, y pobreza
teatral a » teatral e, teatral las, teatral de
p perez » c perez, d perez, puy perez

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 celebro ((de pobreza) OR (p perez)) teatral a documentos de pianoforte.~".
• Adding a wildcard symbol may retrieve word variants: Biblioteca lirica : pezzi celebro ((de pobreza) OR (p perez)) teatral a documentos de pianoforte.*.