Perhaps you should try some spelling variations:
perov » petrov (Expand Search)
peteruov » petrov (Expand Search)
petruuov » petrov (Expand Search), peteruuov (Expand Search), petriuuov (Expand Search), petruuuov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (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 (((perov OR petriv) OR (peteruov OR petruuov)) OR (((petriu OR petrio) OR per) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((perov OR petriv) OR (peteruov OR petruuov)) OR (((petriu OR petrio) OR per) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((perov OR petriv) OR (peteruov OR petruuov)) OR (((petriu OR petrio) OR per) OR petr)) o.s.*.