Perhaps you should try some spelling variations:
distribution politiche » distribution political, distributional politics, distribution policy
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 _)) delta distribution politiche.
• Adding a wildcard symbol may retrieve word variants: storia der ((idee de) or (idee _)) delta distribution politiche*.