Perhaps you should try some spelling variations:
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petruioov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petroiv » peteroiv (Expand Search), petrioiv (Expand Search), petruoiv (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petriioov » peteriioov (Expand Search), petriiioov (Expand Search), petruiioov (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 ((petriv OR petroiv) OR ((petrou OR ((petroov OR petrioov) OR petriioov)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriv OR petroiv) OR ((petrou OR ((petroov OR petrioov) OR petriioov)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriv OR petroiv) OR ((petrou OR ((petroov OR petrioov) OR petriioov)) OR petr)) o.s.*.