Perhaps you should try some spelling variations:
physical scientists » political scientists, physical societies
medical scientists » biomedical scientists, american scientists, medical sciences
physical sciences » medical 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 scientists) OR (((physical scientists) OR (physical sciences))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "robert walsh (((medical scientists) or (((physical scientists) OR (physical sciences)))))".
• Adding a wildcard symbol may retrieve word variants: robert walsh (((medical scientists) or (((physical scientists) OR (physical sciences)))))*.