Perhaps you should try some spelling variations:
universitat bochum » universitat bonn (Expand Search)
ruhr » ruhe (Expand Search), nuhr (Expand Search), rohr (Expand Search)
lohr » lehr (Expand Search), rohr (Expand Search)
lahr » jahr (Expand Search), lehr (Expand Search), bahr (Expand Search)
mohr » mehr (Expand Search), moor (Expand Search), rohr (Expand Search)
mohn » sohn (Expand Search), hohn (Expand Search), john (Expand Search)
lahn » hahn (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: (ruhr OR (((lohr OR lahr) OR (mohr OR (mohn OR bohn))) OR (lahn OR leer))) universitat bochum~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(ruhr OR (((lohr OR lahr) OR (mohr OR (mohn OR bohn))) OR (lahn OR leer))) universitat bochum".
• Adding a wildcard symbol may retrieve word variants: (ruhr OR (((lohr OR lahr) OR (mohr OR (mohn OR bohn))) OR (lahn OR leer))) universitat bochum*.