Perhaps you should try some spelling variations:
istituzioni politischen » istituzioni politiche, istituzioni politica, institutionen politischer
institution politischer » institutionen politischer, institutionen politische, institutions political
teoria della » storia della
storia del » historia del, storia della, storia e
der delle » der modelle, der delete, der delta

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: ((teoria della) OR (storia del)) idee der delle ((istituzioni politischen) OR (institution politischer)).
• Adding a wildcard symbol may retrieve word variants: ((teoria della) or (storia del)) idee der delle ((istituzioni politischen) or (institution politischer))*.