Perhaps you should try some spelling variations:
medical scientists » biomedical scientists, american scientists, physical scientists
robert walter » robert walters, roberts walter, robert walker
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) OR (robert walter)) (medical scientists).
• Adding a wildcard symbol may retrieve word variants: ((robert walsh) or (robert walter)) (medical scientists)*.