Perhaps you should try some spelling variations:
johannes fischer » johan fischer, johannes fechner, johannes liesche
johannes pfister » johanne foster, johannes dieter, johannes koster
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 (johannes pfister))) OR (johanna fischer))) OR (johann (fischart OR fischers))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((johannes fischer) OR (johannes pfister))) or (johanna fischer))) or (johann (fischart or fischers)))".
• Adding a wildcard symbol may retrieve word variants: ((((((johannes fischer) OR (johannes pfister))) or (johanna fischer))) or (johann (fischart or fischers)))*.