Perhaps you should try some spelling variations:
political vernieuwing » political interviewing
services overview » services service, services over, overview overview
studies overview » study overview, issues overview
power political » power politics, our political, war political
studies power » studies poster, studies peter, studies per
studies over » studies novel, studies other

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: (( ((studies over) OR (((studies overview) OR (services overview)))) politieke vernieuwing ) OR ( studies power political vernieuwing )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((studies over) or (((studies overview) OR (services overview)))) politieke vernieuwing ) or ( studies power political vernieuwing ))".
• Adding a wildcard symbol may retrieve word variants: (( ((studies over) or (((studies overview) OR (services overview)))) politieke vernieuwing ) or ( studies power political vernieuwing ))*.