Perhaps you should try some spelling variations:
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petro » petero (Expand Search), petrio (Expand Search), petruo (Expand Search), petrov (Expand Search), petri (Expand Search), petru (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search), petri (Expand Search), petru (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search), petrovi (Expand Search), petrii (Expand Search), petrui (Expand Search), petri (Expand Search), petrov (Expand Search), petrow (Expand Search)
pero » per (Expand Search), pro (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 (((peruw OR (petr OR petro)) o) OR (((pero OR petrui) OR petroi) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peruw OR (petr OR petro)) o) OR (((pero OR petrui) OR petroi) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((peruw OR (petr OR petro)) o) OR (((pero OR petrui) OR petroi) _)). s.*.