Perhaps you should try some spelling variations:
"studenten der _ school of governance" » "studenten und _ school of governance"
"studien der pisa school of governance" » "studie der pisa school of governance", "studien der pisa schools of governance", "studien der pa school of governance", "studien der pisa schock of governance"

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: (("studenten der _ school of governance") OR ("studien der pisa school of governance"))*.
• Removing quotes may allow a broader search: (( studenten der _ school of governance ) or ( studien der pisa school of governance ))*.