Perhaps you should try some spelling variations:
ruhr » ruhe (Expand Search), nuhr (Expand Search), rohr (Expand Search)
mohr » mehr (Expand Search), lohr (Expand Search), mohn (Expand Search)
mbohn » bohn (Expand Search), mohn (Expand Search), mbohne (Expand Search), mbhohn (Expand Search), mbbohn (Expand Search)
sohn » sohne (Expand Search), shohn (Expand Search), sbohn (Expand Search)
ohn » ohne (Expand Search), hohn (Expand Search), bohn (Expand Search)
shohn » shohne (Expand Search), shhohn (Expand Search), shbohn (Expand Search), hohn (Expand Search)
hbhohn » hbhohne (Expand Search), hbhhohn (Expand Search), hbhbohn (Expand Search)
sjjhohn » sjjhohne (Expand Search), sjjhhohn (Expand Search), sjjhbohn (Expand Search)
university » universitat (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 ((mohr OR (((sohn OR mbohn) OR ohn) OR shohn)) OR (hbhohn OR sjjhohn))) university bochum~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(ruhr OR ((mohr OR (((sohn OR mbohn) OR ohn) OR shohn)) OR (hbhohn OR sjjhohn))) university bochum*".