Perhaps you should try some spelling variations:
petrooov » petrov (Expand Search), peterooov (Expand Search), petriooov (Expand Search), petruooov (Expand Search)
peteroiv » petrov (Expand Search), peterdi (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruouoov » peteruouoov (Expand Search), petriuouoov (Expand Search), petruuouoov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)

Try widening your search to All Fields.

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 peterov) OR (petrooov OR petruouoov)) OR peteroiv) OR (petroi OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruov OR peterov) OR (petrooov OR petruouoov)) OR peteroiv) OR (petroi OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruov OR peterov) OR (petrooov OR petruouoov)) OR peteroiv) OR (petroi OR petr)) o.s.*.