Perhaps you should try some spelling variations:
"karl friedrich goerdeler" » "la friedrich goerdeler" (Expand Search), "halm friedrich goerdeler" (Expand Search), "knauer friedrich goerdeler" (Expand Search)
"karl dietrich goerdeler" » "kurt dietrich goerdeler" (Expand Search), "hans dietrich goerdeler" (Expand Search)
"fur friedrich goerdeler" » "rub friedrich goerdeler" (Expand Search), "heer friedrich goerdeler" (Expand Search), "la friedrich goerdeler" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("karl friedrich goerdeler") OR ("karl dietrich goerdeler"))) OR ("fur friedrich goerdeler"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"karl friedrich goerdeler\") OR (\"karl dietrich goerdeler\"))) OR (\"fur friedrich goerdeler\"))".
• Removing quotes may allow a broader search: (((( karl friedrich goerdeler ) OR ( karl dietrich goerdeler ))) OR ( fur friedrich goerdeler )).
• Adding a wildcard symbol may retrieve word variants: (((("karl friedrich goerdeler") OR ("karl dietrich goerdeler"))) OR ("fur friedrich goerdeler"))*.