Perhaps you should try some spelling variations:
political scientists » political science, social scientists
political scientist » political sciences, clinical scientist, political science
mark webber » mark weber, mr webber, mark yeber
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 webber) OR (mark weiser)) (((political scientist) OR (political scientists))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mark webber) OR (mark weiser)) (((political scientist) or (political scientists)))".
• Adding a wildcard symbol may retrieve word variants: ((mark webber) OR (mark weiser)) (((political scientist) or (political scientists)))*.