Perhaps you should try some spelling variations:
ostforschung des » erforschung des (Expand Search), ostforschung 18 (Expand Search), ostforschung lander (Expand Search)
instituts zur » instituts fur (Expand Search), instituts der (Expand Search)
institut fur » instituts fur (Expand Search), instituts der (Expand Search)
institut der » instituts der (Expand Search), instituts fur (Expand Search)
des udssr » der udssr (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((institut fur) OR (((institut der) OR (instituts zur)))) ostforschung des udssr e. v.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((institut fur) OR (((institut der) OR (instituts zur)))) ostforschung des udssr e. v.".
• Adding a wildcard symbol may retrieve word variants: ((institut fur) OR (((institut der) OR (instituts zur)))) ostforschung des udssr e. v.*.