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