Perhaps you should try some spelling variations:
medical scientist » medical scientists, medical scientific, american scientist
robert walsh » robert walser, robert walt, robert walsers
robert welch » robert weech, robert wrench, robert wells

You may be able to get more results by adjusting your search query.

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