Perhaps you should try some spelling variations:
peruov » perov (Expand Search)
peru » per (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petriuo » peteriuo (Expand Search), petroiuo (Expand Search), periuo (Expand Search)
petriiuo » peteriiuo (Expand Search), petroiiuo (Expand Search), periiuo (Expand Search)
petr » peter (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 ((peruov OR peterov) OR ((((petru OR petri) OR peru) OR (petriuo OR petriiuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peruov OR peterov) OR ((((petru OR petri) OR peru) OR (petriuo OR petriiuo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peruov OR peterov) OR ((((petru OR petri) OR peru) OR (petriuo OR petriiuo)) OR petr)) o.s.*.