Perhaps you should try some spelling variations:
"risk gustav heinrich" » "risk auguste heinrich", "noske gustav heinrich"
"risk gustavi erici" » "risk gustav erich", "noske gustavi erici"
"werk gustav resch" » "werk gustav erich", "werk gustav roth", "werner gustav resch", "heart gustav resch"

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: (("werk gustav resch") OR ((("risk gustavi erici") OR ("risk gustav heinrich")))).
• Removing quotes may allow a broader search: (( werk gustav resch ) or ((( risk gustavi erici ) or ( risk gustav heinrich )))).
• Adding a wildcard symbol may retrieve word variants: (("werk gustav resch") or ((("risk gustavi erici") or ("risk gustav heinrich"))))*.