Perhaps you should try some spelling variations:
"hans nielsen paul" » "hans niels paul", "hans nelen paul", "jane nielsen paul"
"hans kelsen paul" » "hans axelsen paul", "hans jensen paul", "hans hensen paul"
"hans keller paul" » "hans bellmer paul", "lane keller paul", "hans haller paul", "hans weller paul", "hans muller paul", "hans miller paul"

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: (("hans nielsen paul") OR ((("hans kelsen paul") OR ("hans keller paul")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"hans nielsen paul\") or (((\"hans kelsen paul\") OR (\"hans keller paul\"))))".
• Removing quotes may allow a broader search: (( hans nielsen paul ) or ((( hans kelsen paul ) OR ( hans keller paul )))).
• Adding a wildcard symbol may retrieve word variants: (("hans nielsen paul") or ((("hans kelsen paul") OR ("hans keller paul"))))*.