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 » mr webber, mark weiser, mark yeber
mark weber » marx weber, mark yeber, maria weber

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