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