Perhaps you should try some spelling variations:
petrooiv » petrov (Expand Search), peterooiv (Expand Search), petruooiv (Expand Search), petroooiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruoi » peteruoi (Expand Search), petruuoi (Expand Search), petrouoi (Expand Search)
petruouov » peteruouov (Expand Search), petruuouov (Expand Search), petrououov (Expand Search)
petrio » peterio (Expand Search), petruio (Expand Search), petroio (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 ((petrooiv OR petrooiv) OR ((((petri OR petruoi) OR petruouov) OR petrio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrooiv OR petrooiv) OR ((((petri OR petruoi) OR petruouov) OR petrio) OR petr)) o.s.*".