Perhaps you should try some spelling variations:
physical scientists » political scientists, physical sciences, physical societies
medical sciences » social sciences
robert walsh » robert walser, robert walt, robert welch

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: robert walsh (((medical sciences) OR (physical scientists))).
• Adding a wildcard symbol may retrieve word variants: robert walsh (((medical sciences) or (physical scientists)))*.