Perhaps you should try some spelling variations:
political sciences » political science, political scientists, biological sciences
technical sciences » medical sciences, chemical sciences, technical advances
clinical sciences » clinical science, chemical sciences, empirical sciences

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