Perhaps you should try some spelling variations:
petrooov » petrov (Expand Search), peterooov (Expand Search), petriooov (Expand Search), petruooov (Expand Search)
petriioov » peteriioov (Expand Search), petriiioov (Expand Search), petruiioov (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petroou » peteroou (Expand Search), petrioou (Expand Search), petruoou (Expand Search)
petrooiu » peterooiu (Expand Search), petriooiu (Expand Search), petruooiu (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 ((petriioov OR petrooov) OR ((((petrou OR petroou) OR petrooiu) OR peteru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriioov OR petrooov) OR ((((petrou OR petroou) OR petrooiu) OR peteru) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriioov OR petrooov) OR ((((petrou OR petroou) OR petrooiu) OR peteru) OR petr)) o.s.*.