Perhaps you should try some spelling variations:
perv » per (Expand Search)
peri » per (Expand Search)
petruuuov » peteruuuov (Expand Search), petruuuuov (Expand Search), petrouuuov (Expand Search)
petroiv » peteroiv (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search)
petroou » peteroou (Expand Search), petruoou (Expand Search), petrooou (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (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 ((((peterov OR petruuuov) OR petroiv) OR perv) OR ((petroou OR (petri OR peri)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((peterov OR petruuuov) OR petroiv) OR perv) OR ((petroou OR (petri OR peri)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((peterov OR petruuuov) OR petroiv) OR perv) OR ((petroou OR (petri OR peri)) OR petr)) o.s.*.