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"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"erik gustav erich\") OR (\"erik gustav heinrich\"))".
• Removing quotes may allow a broader search: (( erik gustav erich ) OR ( erik gustav heinrich )).
• Adding a wildcard symbol may retrieve word variants: (("erik gustav erich") OR ("erik gustav heinrich"))*.