Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petriov (Expand Search), petroov (Expand Search), perov (Expand Search)
petruov » pentruov (Expand Search), petriov (Expand Search), petriuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petriv » petri (Expand Search), petriiv (Expand Search), petroiv (Expand Search), periv (Expand Search)
petris » petri (Expand Search), petriis (Expand Search), petrois (Expand Search), peris (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petrioi » petriioi (Expand Search), petroioi (Expand Search), perioi (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 (((petruov OR petrov) OR (petru OR (petriv OR petris))) OR ((petr OR petrioi) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR petrov) OR (petru OR (petriv OR petris))) OR ((petr OR petrioi) OR peter)) o.s.*".