Perhaps you should try some spelling variations:
"biographical research" » "biomedical research"
"biographical sketch" » "biographical sketches"
"biological research" » "biomedical research", "biology research"

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: (((("biographical research") OR ("biographical sketch"))) OR ("biological research")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"biographical research\") OR (\"biographical sketch\"))) or (\"biological research\"))".
• Removing quotes may allow a broader search: (((( biographical research ) OR ( biographical sketch ))) or ( biological research )).
• Adding a wildcard symbol may retrieve word variants: (((("biographical research") OR ("biographical sketch"))) or ("biological research"))*.