Perhaps you should try some spelling variations:
"johannes dieter muller" » "johannes dietlein muller", "johannes pfister muller", "johannes richter muller", "johannes dietmar muller", "johannes gunter muller", "johannes der muller"
"johannes heiner muller" » "johannes heike muller", "johannes heller muller", "johannes horner muller"
"johannes peter muller" » "johann peter muller", "johannes beutler muller", "johannes pfister 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 dieter muller") OR ((("johannes peter muller") OR ("johannes heiner muller")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"johannes dieter muller\") or (((\"johannes peter muller\") OR (\"johannes heiner muller\"))))".
• Removing quotes may allow a broader search: (( johannes dieter muller ) or ((( johannes peter muller ) OR ( johannes heiner muller )))).
• Adding a wildcard symbol may retrieve word variants: (("johannes dieter muller") or ((("johannes peter muller") OR ("johannes heiner muller"))))*.