Perhaps you should try some spelling variations:
peterow » petrow (Expand Search)
petruov » petrov (Expand Search), peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petruvw » peteruvw (Expand Search), petruuvw (Expand Search), petrouvw (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruui » peteruui (Expand Search), petruuui (Expand Search), petrouui (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: fop ((((petruvw OR peterow) OR peterow) o) OR (((petruov OR (petr OR petri)) OR petruui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruvw OR peterow) OR peterow) o) OR (((petruov OR (petr OR petri)) OR petruui) _)). s.*".