Perhaps you should try some spelling variations:
gustav heinrich » auguste heinrich
heart gustav » helmut gustav, carl gustav, horn gustav
gustav erich » gustavi erici, gustav friedrich, gustav brink
werk gustav » werner gustav
risk gustav » krieg gustav

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) OR (heart gustav)) resch ) OR ((( risk gustav erich ) OR ( risk gustav heinrich )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((werk gustav) OR (heart gustav)) resch ) or ((( risk gustav erich ) or ( risk gustav heinrich ))))".
• Adding a wildcard symbol may retrieve word variants: (( ((werk gustav) OR (heart gustav)) resch ) or ((( risk gustav erich ) or ( risk gustav heinrich ))))*.