Perhaps you should try some spelling variations:
peri » petri (Expand Search), per (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petrouv (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petroiuv (Expand Search)
petroouov » peteroouov (Expand Search), petrioouov (Expand Search), petrooouov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petroiio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 (((petruv OR petriuv) OR (petroouov OR peruov)) OR (((peri OR petru) OR petriio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruv OR petriuv) OR (petroouov OR peruov)) OR (((peri OR petru) OR petriio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruv OR petriuv) OR (petroouov OR peruov)) OR (((peri OR petru) OR petriio) OR petr)) o.s.*.