Perhaps you should try some spelling variations:
biomedical scientists » biomedical scientific, medical scientists, biomedical sciences
robert welch » robert weech, robert wrench, robert wells
robert walt » robert wait, robert walter, robert watts
robert watt » robert watson, robert white

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 watt)) (biomedical scientists).
• Adding a wildcard symbol may retrieve word variants: ((((robert walt) or (robert welch))) or (robert watt)) (biomedical scientists)*.