Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
perov » petrov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petroiv (Expand Search)
petroiv » peteroiv (Expand Search), petrioiv (Expand Search), petrooiv (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petroio (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (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 ((peteriov OR (petriv OR petroiv)) OR ((((petrio OR petru) OR peruo) OR perov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriov OR (petriv OR petroiv)) OR ((((petrio OR petru) OR peruo) OR perov) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteriov OR (petriv OR petroiv)) OR ((((petrio OR petru) OR peruo) OR perov) OR petr)) o.s.*.