Perhaps you should try some spelling variations:
douze istituzioni » delle istituzioni, e istituzioni, le istituzioni
historia delle » storia delle, historia degl, historia desde
historia del » historia de
idee de » idee der, idee des, idee die
politiche » politische, politischen, politischer

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: ((historia delle) OR (historia del)) idee de douze istituzioni politiche.
• Adding a wildcard symbol may retrieve word variants: ((historia delle) or (historia del)) idee de douze istituzioni politiche*.