Perhaps you should try some spelling variations:
petrio » petro (Expand Search), peterio (Expand Search), petruio (Expand Search), petroio (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petruis » peteruis (Expand Search), petruuis (Expand Search), petrouis (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrou » peterou (Expand Search), petruou (Expand Search), petroou (Expand Search), petru (Expand Search), petro (Expand Search), petrov (Expand Search)
petroou » peteroou (Expand Search), petruoou (Expand Search), petrooou (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (peteriv OR (((petris OR petruis) OR petrio) OR (petr OR ((petrou OR petroou) OR petri)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peteriv OR (((petris OR petruis) OR petrio) OR (petr OR ((petrou OR petroou) OR petri)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (peteriv OR (((petris OR petruis) OR petrio) OR (petr OR ((petrou OR petroou) OR petri)))) o.s.*.