Perhaps you should try some spelling variations:
political scientist » political scientists, political sciences, political science
clinical scientist » clinical scientific, clinical sciences, political scientists
mark webber » mark weber, mr webber, mark weiser

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "mark webber (((political scientist) OR (clinical scientist)))".
• Adding a wildcard symbol may retrieve word variants: mark webber (((political scientist) OR (clinical scientist)))*.