Perhaps you should try some spelling variations:
petrouiv » petrov (Expand Search), peterouiv (Expand Search), petroouiv (Expand Search), perouiv (Expand Search)
peri » per (Expand Search)
petroiv » peteroiv (Expand Search), petrooiv (Expand Search), peroiv (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petrou » peterou (Expand Search), petroou (Expand Search), perou (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (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 ((peruv OR (petroiv OR petrouiv)) OR ((((petru OR petrou) OR petri) OR peri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peruv OR (petroiv OR petrouiv)) OR ((((petru OR petrou) OR petri) OR peri) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peruv OR (petroiv OR petrouiv)) OR ((((petru OR petrou) OR petri) OR peri) OR petr)) o.s.*.