Perhaps you should try some spelling variations:
ruhr » ruhe (Expand Search), nuhr (Expand Search), rohr (Expand Search)
lohr » lehr (Expand Search), rohr (Expand Search)
mohr » moor (Expand Search), rohr (Expand Search)
mehr » meer (Expand Search)
lahr » jahr (Expand Search), lahn (Expand Search), lehr (Expand Search)
mohn » sohn (Expand Search), hohn (Expand Search), john (Expand Search)
bohn » bonn (Expand Search), sohn (Expand Search), hohn (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 ((((lohr OR mohr) OR mehr) OR lahr) OR (mohn OR bohn))) university bochum~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(ruhr OR ((((lohr OR mohr) OR mehr) OR lahr) OR (mohn OR bohn))) university bochum*".