Perhaps you should try some spelling variations:
biomedical scientists » biomedical scientific, biomedical sciences, biomedical science
medical scientists » american scientists, physical scientists, medical sciences
robert welch » robert weech, robert wrench, robert wells
robert watt » robert watson

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