Perhaps you should try some spelling variations:
medical scientists » biomedical scientists, american scientists, physical scientists
robert watson » robert nelson, robert warren
robert welch » robert weech, robert wrench, robert wells
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 walt) OR (robert welch))) OR (robert watson)) (medical scientists).
• Adding a wildcard symbol may retrieve word variants: ((((robert walt) or (robert welch))) or (robert watson)) (medical scientists)*.