Perhaps you should try some spelling variations:
"polnischer academy of sciences" » "polnische academy of sciences" (Expand Search), "polnischen academy of sciences" (Expand Search), "polnisch academy of sciences" (Expand Search), "polnischer academia of sciences" (Expand Search), "polnischer academic of sciences" (Expand Search), "polnischer academie of sciences" (Expand Search)
"polnischeen academy of sciences" » "polnischeen academia of sciences" (Expand Search), "polnischeen academic of sciences" (Expand Search), "polnischeen academie of sciences" (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: (("polnischer academy of sciences") OR ("polnischeen academy of sciences"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"polnischer academy of sciences\") OR (\"polnischeen academy of sciences\"))*".
• Removing quotes may allow a broader search: (( polnischer academy of sciences ) OR ( polnischeen academy of sciences ))*.