Perhaps you should try some spelling variations:
perov » petrov (Expand Search)
peruov » petruov (Expand Search), perov (Expand Search)
peru » petru (Expand Search), per (Expand Search)
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petruuiv (Expand Search)
petriuuov » peteriuuov (Expand Search), petriiuuov (Expand Search), petruiuuov (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (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 petruiv) OR (peruov OR petriuuov)) OR (((petruuo OR petero) OR peru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((perov OR petruiv) OR (peruov OR petriuuov)) OR (((petruuo OR petero) OR peru) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((perov OR petruiv) OR (peruov OR petriuuov)) OR (((petruuo OR petero) OR peru) OR petr)) o.s.*.