Perhaps you should try some spelling variations:
della distribuzione » delle distribuzioni, la distribuzione
delta distribution » data distribution, beta distribution, la distribution
storia der » storia del, storia dei, storia de
idee de » idee der, idee des, idee die

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: storia der ((idee de) OR (idee _)) ((della distribuzione) OR (delta distribution)) politiche.
• The words AND, OR and NOT may confuse the search; try adding quotes: "storia der ((idee de) or (idee _)) ((della distribuzione) OR (delta distribution)) politiche".
• Adding a wildcard symbol may retrieve word variants: storia der ((idee de) or (idee _)) ((della distribuzione) OR (delta distribution)) politiche*.