Perhaps you should try some spelling variations:
johannes fischer » johan fischer, johannes fechner, johannes liesche
johannes berchem » johannes becker, johannes berger, johannes bechteln
johanna fischer » johan fischer, johann fischart, johanna kissler

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 fischer) OR (johanna fischer))) OR (johannes berchem)).
• Adding a wildcard symbol may retrieve word variants: ((((johannes fischer) or (johanna fischer))) or (johannes berchem))*.