Perhaps you should try some spelling variations:
petrw » petrow (Expand Search), petro (Expand Search), petra (Expand Search), peterw (Expand Search), perw (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petriu » peteriu (Expand Search), petroiu (Expand Search), periu (Expand Search), petris (Expand Search)
petruv » peteruv (Expand Search), petrouv (Expand Search), peruv (Expand Search), pentruv (Expand Search), petrov (Expand Search)
petrv » peterv (Expand Search), petrov (Expand Search), perv (Expand Search), petro (Expand Search), petra (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 (((petrw OR (petr OR petri)) o) OR (((petru OR petriu) OR (petruv OR petrv)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrw OR (petr OR petri)) o) OR (((petru OR petriu) OR (petruv OR petrv)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petrw OR (petr OR petri)) o) OR (((petru OR petriu) OR (petruv OR petrv)) _)). s.*.