Perhaps you should try some spelling variations:
el pianoforte » del pianoforte, e pianoforte, per pianoforte
generales el » generales del, generales en, generales de
di gases » de gases, de bases, _ gases
de fases » de gases, de bases, de clases
caso el » caso del, caso en, casos en
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 gases) OR (de fases)) generales el caso el pianoforte.~".
• Adding a wildcard symbol may retrieve word variants: Biblioteca lirica : pezzi celebri ((di gases) OR (de fases)) generales el caso el pianoforte.*.