Perhaps you should try some spelling variations:
petruo » petro (Expand Search), pentruo (Expand Search), peteruo (Expand Search), petrouo (Expand Search), peruo (Expand Search)
petruuo » pentruuo (Expand Search), peteruuo (Expand Search), petrouuo (Expand Search), peruuo (Expand Search)
petruuouo » pentruuouo (Expand Search), peteruuouo (Expand Search), petrouuouo (Expand Search), peruuouo (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petris » peteris (Expand Search), petrois (Expand Search), peris (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (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 (petris OR (((petruo OR (petruuo OR petruuouo)) OR petru) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petris OR (((petruo OR (petruuo OR petruuouo)) OR petru) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petris OR (((petruo OR (petruuo OR petruuouo)) OR petru) OR (petr OR petri))) o.s.*.