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