Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), pentruov (Expand Search), peteruov (Expand Search), petrouov (Expand Search)
petroov » petrov (Expand Search), peteroov (Expand Search), petrooov (Expand Search)
petruouov » pentruouov (Expand Search), peteruouov (Expand Search), petrououov (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search)
peterv » peter (Expand Search), peters (Expand Search)
petr » peter (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petroi (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 ((((petruov OR (petruouov OR petroov)) OR petru) OR peterv) OR ((petr OR per) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruov OR (petruouov OR petroov)) OR petru) OR peterv) OR ((petr OR per) OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruov OR (petruouov OR petroov)) OR petru) OR peterv) OR ((petr OR per) OR petri)) o.s.*.