Perhaps you should try some spelling variations:
perv » per (Expand Search)
peri » petri (Expand Search), per (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petriiu » peteriiu (Expand Search), petriiiu (Expand Search), petroiiu (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petroui (Expand Search)
petrouui » peterouui (Expand Search), petriouui (Expand Search), petroouui (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 ((peteriv OR perv) OR ((((petru OR petriiu) OR peri) OR (petrui OR petrouui)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriv OR perv) OR ((((petru OR petriiu) OR peri) OR (petrui OR petrouui)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteriv OR perv) OR ((((petru OR petriiu) OR peri) OR (petrui OR petrouui)) OR petr)) o.s.*.