Perhaps you should try some spelling variations:
"studies over political vernieuwing" » "studies over political interviewing", "studies other political vernieuwing", "studies power political vernieuwing", "studies order political vernieuwing", "studies novel political vernieuwing", "studies overview political vernieuwing"
"Studies over positive veranderung" » "Studies over seine veranderung", "Studies over positive verstarkung", "Studies other positive veranderung", "Studies oder positiver veranderung", "Studies der positive veranderung"
"studies over politieke vernieuwing" » "studies over policies vernieuwing", "studies en politieke vernieuwing", "studies novel politieke vernieuwing", "studies other politieke vernieuwing", "studies overview politieke vernieuwing"
"Studies over positive vernieuwing" » "Studies other positive vernieuwing", "Studies oder positiver vernieuwing", "Studies der positive vernieuwing"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("studies over politieke vernieuwing") OR ((("Studies over positive vernieuwing") OR ("Studies over positive veranderung"))))) OR ("studies over political vernieuwing")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"studies over politieke vernieuwing\") or (((\"Studies over positive vernieuwing\") OR (\"Studies over positive veranderung\"))))) or (\"studies over political vernieuwing\"))".
• Removing quotes may allow a broader search: (((( studies over politieke vernieuwing ) or ((( Studies over positive vernieuwing ) OR ( Studies over positive veranderung ))))) or ( studies over political vernieuwing )).
• Adding a wildcard symbol may retrieve word variants: (((("studies over politieke vernieuwing") or ((("Studies over positive vernieuwing") OR ("Studies over positive veranderung"))))) or ("studies over political vernieuwing"))*.