Perhaps you should try some spelling variations:
petriw » petrow (Expand Search), peteriw (Expand Search), petroiw (Expand Search), periw (Expand Search)
petruv » petrov (Expand Search), peteruv (Expand Search), petrouv (Expand Search), peruv (Expand Search), pentruv (Expand Search)
petruo » petro (Expand Search), peteruo (Expand Search), petrouo (Expand Search), peruo (Expand Search), pentruo (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petris » peteris (Expand Search), petrois (Expand Search), peris (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 (((petriw OR ((petruv OR petri) OR petruo)) o) OR (((petr OR petru) OR petris) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriw OR ((petruv OR petri) OR petruo)) o) OR (((petr OR petru) OR petris) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriw OR ((petruv OR petri) OR petruo)) o) OR (((petr OR petru) OR petris) _)). s.*.