Perhaps you should try some spelling variations:
peru » petru (Expand Search), per (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petroou » peteroou (Expand Search), petrioou (Expand Search), petruoou (Expand Search)
petruoou » peteruoou (Expand Search), petriuoou (Expand Search), petruuoou (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 (((petriv OR petriv) OR petruov) OR ((petroi OR ((petroou OR petruoou) OR peru)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriv OR petriv) OR petruov) OR ((petroi OR ((petroou OR petruoou) OR peru)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriv OR petriv) OR petruov) OR ((petroi OR ((petroou OR petruoou) OR peru)) OR petr)) o.s.*.