Perhaps you should try some spelling variations:
accademia di » academia _
le lettere » di lettere, delle lettere, love letters
e lettere » di lettere
de letter » de lettres, one letter
istituto » instituto

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

• If you are trying to use Boolean operators, they must be ALL CAPS: istituto (lombardo OR lombardi) accademia di scienze ((((e lettere) OR (le lettere))) OR (de letter)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "istituto (lombardo or lombardi) accademia di scienze ((((e lettere) OR (le lettere))) or (de letter))".
• Adding a wildcard symbol may retrieve word variants: istituto (lombardo or lombardi) accademia di scienze ((((e lettere) OR (le lettere))) or (de letter))*.