Perhaps you should try some spelling variations:
"polnisch biographical dictionary" » "polnische biographical dictionary" (Expand Search), "polnischer biographical dictionary" (Expand Search), "polnisch biographische dictionary" (Expand Search), "polnisch biographie dictionary" (Expand Search), "polnisch biographi dictionary" (Expand Search)
"polnischen biographical dictionary" » "polnischeen biographical dictionary" (Expand Search), "polnischeren biographical dictionary" (Expand Search), "polnischen biographische dictionary" (Expand Search), "polnischen biographie dictionary" (Expand Search), "polnischen biographi dictionary" (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: (("polnisch biographical dictionary") OR ("polnischen biographical dictionary"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"polnisch biographical dictionary\") OR (\"polnischen biographical dictionary\"))".
• Removing quotes may allow a broader search: (( polnisch biographical dictionary ) OR ( polnischen biographical dictionary )).
• Adding a wildcard symbol may retrieve word variants: (("polnisch biographical dictionary") OR ("polnischen biographical dictionary"))*.