Perhaps you should try some spelling variations:
perov » petrov (Expand Search)
petriov » peteriov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petriuv » peteriuv (Expand Search), petroiuv (Expand Search), periuv (Expand Search)
petriv » peteriv (Expand Search), petroiv (Expand Search), periv (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (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 ((((perov OR petriov) OR petriuv) OR petriv) OR (((petero OR petri) OR petru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((perov OR petriov) OR petriuv) OR petriv) OR (((petero OR petri) OR petru) OR petr)) o.s.*".