Perhaps you should try some spelling variations:
petrooov » petrov (Expand Search), peterooov (Expand Search), petriooov (Expand Search), petruooov (Expand Search)
petruioov » peteruioov (Expand Search), petriuioov (Expand Search), petruuioov (Expand Search)
petruiioov » peteruiioov (Expand Search), petriuiioov (Expand Search), petruuiioov (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petruou » peteruou (Expand Search), petriuou (Expand Search), petruuou (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((petrooov OR ((petruioov OR petruioov) OR petruiioov)) OR ((petriu OR petruou) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrooov OR ((petruioov OR petruioov) OR petruiioov)) OR ((petriu OR petruou) OR petr)) o.s.*".