Perhaps you should try some spelling variations:
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petroioov (Expand Search)
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petroiiov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petroou » peteroou (Expand Search), petrioou (Expand Search), petrooou (Expand Search)
petriou » peteriou (Expand Search), petriiou (Expand Search), petroiou (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 petriiov) OR peteriv) OR ((petru OR (petroou OR petriou)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrioov OR petriiov) OR peteriv) OR ((petru OR (petroou OR petriou)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petrioov OR petriiov) OR peteriv) OR ((petru OR (petroou OR petriou)) OR petr)) o.s.*.