Perhaps you should try some spelling variations:
"johannes richter muller" » "johannes michael muller", "johan richter muller", "johannes dieter muller", "johannes pachter muller", "johannes wachter muller", "johannes richter holger"
"johannes heiner muller" » "johannes heike muller", "johannes heller muller", "johannes horner muller"
"johannes peter muller" » "johannes dieter muller", "johann peter muller", "johannes beutler muller", "johannes peter miller", "johannes peter koller", "johannes geiger muller"

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: (("johannes richter muller") OR ((("johannes peter muller") OR ("johannes heiner muller")))).
• Removing quotes may allow a broader search: (( johannes richter muller ) or ((( johannes peter muller ) or ( johannes heiner muller )))).
• Adding a wildcard symbol may retrieve word variants: (("johannes richter muller") or ((("johannes peter muller") or ("johannes heiner muller"))))*.