Perhaps you should try some spelling variations:
political sciences » political science, clinical sciences, political scientists
social scientists » social sciences
mark weiser » mark zweiter, mark weber, mark weiss

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: mark weiser (((political sciences) OR (social scientists))).
• Adding a wildcard symbol may retrieve word variants: mark weiser (((political sciences) or (social scientists)))*.