Perhaps you should try some spelling variations:
"johannes dieter muller" » "johannes dietlein muller", "johannes pfister muller", "johannes richter muller", "johannes dietmar muller", "johannes peter muller", "johannes gunter muller"
"johannes geiger muller" » "johannes berger muller", "johannes renger muller", "johannes geiss muller", "johannes werner muller"
"johannes heiner muller" » "johannes heike muller", "johannes heller muller", "johannes horner muller"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"johannes dieter muller\") OR (((\"johannes geiger muller\") OR (\"johannes heiner muller\"))))".
• Removing quotes may allow a broader search: (( johannes dieter muller ) OR ((( johannes geiger muller ) OR ( johannes heiner muller )))).
• Adding a wildcard symbol may retrieve word variants: (("johannes dieter muller") OR ((("johannes geiger muller") OR ("johannes heiner muller"))))*.