Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petruov (Expand Search), petroov (Expand Search), perov (Expand Search)
petruov » petruuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petriiv » petruiiv (Expand Search), petroiiv (Expand Search), periiv (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petruoi » petruuoi (Expand Search), petrouoi (Expand Search), peruoi (Expand Search)
petr » petru (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 ((((petrov OR petruov) OR peruiv) OR petriiv) OR ((petri OR petruoi) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrov OR petruov) OR peruiv) OR petriiv) OR ((petri OR petruoi) OR (petr OR peter))) o.s.*".