Perhaps you should try some spelling variations:
"joan robinson" » "john robinson", "bryan robinson", "a robinson"
"mark robinson" » "mary robinson", "a robinson", "m robinson"
"man robinson" » "jane robinson", "alan robinson", "sean robinson"

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