Perhaps you should try some spelling variations:
peris » petris (Expand Search), paris (Expand Search)
petrv » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petriv (Expand Search), petruv (Expand Search)
petrui » petri (Expand Search), petru (Expand Search), petriui (Expand Search), petruui (Expand Search), petroui (Expand Search)
petruou » petriuou (Expand Search), petruuou (Expand Search), petrouou (Expand Search)
petroiu » petrioiu (Expand Search), petruoiu (Expand Search), petrooiu (Expand Search)
petr » petri (Expand Search), petru (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 ((peris OR petrv) OR (((petrui OR petruou) OR petroiu) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peris OR petrv) OR (((petrui OR petruou) OR petroiu) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peris OR petrv) OR (((petrui OR petruou) OR petroiu) OR (petr OR peter))) o.s.*.