Perhaps you should try some spelling variations:
petrov » peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruio » peteruio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petruo » peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search)
petriiuo » peteriiuo (Expand Search), petruiiuo (Expand Search), petroiiuo (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 (petrov OR (((petri OR petruio) OR (petruo OR (petriiuo OR peteruiiuo))) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petrov OR (((petri OR petruio) OR (petruo OR (petriiuo OR peteruiiuo))) OR petr)) o.s.*".