Perhaps you should try some spelling variations:
"erik gustav heinrich" » "erik auguste heinrich", "erik gustaf heinrich", "risk gustav heinrich", "werk gustav heinrich"
"erik gustav erich" » "erik gustavi erici", "erik gustav friedrich", "erik gustav brink", "erik gustaf erich", "risk gustav erich", "werk gustav erich"
"erik gustav roth" » "erik gustaf roth", "risk gustav roth", "werk gustav roth", "erik 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: (("erik gustav roth") OR ((("erik gustav erich") OR ("erik gustav heinrich")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"erik gustav roth\") or (((\"erik gustav erich\") OR (\"erik gustav heinrich\"))))".
• Removing quotes may allow a broader search: (( erik gustav roth ) or ((( erik gustav erich ) OR ( erik gustav heinrich )))).
• Adding a wildcard symbol may retrieve word variants: (("erik gustav roth") or ((("erik gustav erich") OR ("erik gustav heinrich"))))*.