Perhaps you should try some spelling variations:
le istituzioni » e istituzioni, delle istituzioni
historia dele » historia delle, historia del, historia desde
idee de » idee der, idee des, idee die
de le » de la, de ce, de re
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 dele) OR (historia de)) idee de le istituzioni politiche.
• Adding a wildcard symbol may retrieve word variants: ((historia dele) or (historia de)) idee de le istituzioni politiche*.