Perhaps you should try some spelling variations:
peteroov » petrov (Expand Search)
petrooov » petrov (Expand Search), peterooov (Expand Search), petriooov (Expand Search), petruooov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petroooio » peteroooio (Expand Search), petrioooio (Expand Search), petruoooio (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 (((peteroov OR petrooov) OR petrooov) OR ((petroi OR (petrio OR petroooio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peteroov OR petrooov) OR petrooov) OR ((petroi OR (petrio OR petroooio)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((peteroov OR petrooov) OR petrooov) OR ((petroi OR (petrio OR petroooio)) OR petr)) o.s.*.