Perhaps you should try some spelling variations:
"samuel hartlib cohen" » "samuel martin cohen", "samuel hartlib john", "samuel harlan cohen", "samuel harold cohen"
"daniel harris cohen" » "samuel harris cohen", "daniel hayes cohen", "daniel garret cohen", "daniel harris when", "daniel harris corner", "daniel harris ben"
"daniel morris cohen" » "daniel torres cohen", "daniel merril cohen", "daniel moores cohen", "daniel morris john", "daniel morris corbyn", "daniel morris noel"

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: (((("daniel harris cohen") OR ("samuel hartlib cohen"))) OR ("daniel morris cohen")).
• Removing quotes may allow a broader search: (((( daniel harris cohen ) or ( samuel hartlib cohen ))) or ( daniel morris cohen )).
• Adding a wildcard symbol may retrieve word variants: (((("daniel harris cohen") or ("samuel hartlib cohen"))) or ("daniel morris cohen"))*.