Perhaps you should try some spelling variations:
medical scientists » biomedical scientists, american scientists, physical scientists
robert walser » robert walker, robert warren, robert watson
robert walsh » robert welch, robert walsers, robert watson
robert walt » robert watt, robert wait, robert walter

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 walser))) OR (robert walt)) (medical scientists).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((robert walsh) OR (robert walser))) or (robert walt)) (medical scientists)".
• Adding a wildcard symbol may retrieve word variants: ((((robert walsh) OR (robert walser))) or (robert walt)) (medical scientists)*.