Perhaps you should try some spelling variations:
"frank richter georg." » "frank michael georg.", "frank richard georg.", "frank richter gebert.", "frank bitter georg.", "frank fischer georg."
"frank ritter jorg." » "frank trotter jorg.", "frank rutger jorg.", "frank dieter jorg.", "frank grutter jorg.", "frank winter jorg.", "frank ritter jonas."

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: (("frank richter georg.") OR ("frank ritter jorg.")).
• Removing quotes may allow a broader search: (( frank richter georg. ) or ( frank ritter jorg. )).
• Adding a wildcard symbol may retrieve word variants: (("frank richter georg.") or ("frank ritter jorg."))*.