Perhaps you should try some spelling variations:
medical scientists » biomedical scientists, american scientists, physical scientists
robert welch » robert weech, robert wrench, robert kelchen
robert wells » robert willis, robert bell, robert wilks
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 welch) OR (robert wells))) OR (robert watt)) (medical scientists).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((robert welch) OR (robert wells))) or (robert watt)) (medical scientists)".
• Adding a wildcard symbol may retrieve word variants: ((((robert welch) OR (robert wells))) or (robert watt)) (medical scientists)*.