Perhaps you should try some spelling variations:
peris » petris (Expand Search), paris (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petrui » pentrui (Expand Search), petrii (Expand Search), petri (Expand Search), petriui (Expand Search), petroui (Expand Search), perui (Expand Search)
petriuou » petriiuou (Expand Search), petroiuou (Expand Search), periuou (Expand Search)
petroiu » petrioiu (Expand Search), petrooiu (Expand Search), peroiu (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (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 petru) OR (((petrui OR petriuou) OR petroiu) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peris OR petru) OR (((petrui OR petriuou) OR petroiu) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peris OR petru) OR (((petrui OR petriuou) OR petroiu) OR (petr OR peter))) o.s.*.