Perhaps you should try some spelling variations:
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petroioov (Expand Search)
petrooov » petrov (Expand Search), peterooov (Expand Search), petriooov (Expand Search), petroooov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petrouo (Expand Search)
petrouiuo » peterouiuo (Expand Search), petriouiuo (Expand Search), petroouiuo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 ((petrioov OR petrooov) OR ((petru OR (petruo OR petrouiuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrioov OR petrooov) OR ((petru OR (petruo OR petrouiuo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrioov OR petrooov) OR ((petru OR (petruo OR petrouiuo)) OR petr)) o.s.*.