Perhaps you should try some spelling variations:
petrov » petriv (Expand Search), petruv (Expand Search), peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petro » petri (Expand Search), petru (Expand Search), petero (Expand Search), petrio (Expand Search), petruo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search), petri (Expand Search), petru (Expand Search)
petris » peteris (Expand Search), petriis (Expand Search), petruis (Expand Search), petri (Expand Search)
petruis » peteruis (Expand Search), petriuis (Expand Search), petruuis (Expand Search), petris (Expand Search), petrus (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (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 petro) o) OR (((petr OR petrui) OR (peteru OR (petris OR petruis))) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrov OR petro) o) OR (((petr OR petrui) OR (peteru OR (petris OR petruis))) _)). s.*".