Perhaps you should try some spelling variations:
petruv » peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petrov » peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petrouov » peterouov (Expand Search), petruouov (Expand Search), petroouov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 (petruv OR (((petrov OR (petruov OR petrouov)) OR petri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petruv OR (((petrov OR (petruov OR petrouov)) OR petri) OR petr)) o.s.*".