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 welch, robert walsers
robert walt » robert watt, robert wait, robert watts

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