Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petrv » peterv (Expand Search), petriv (Expand Search), petruv (Expand Search)
petriuuuo » peteriuuuo (Expand Search), petriiuuuo (Expand Search), petruiuuuo (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petruiio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((petriuv OR petrv) OR (((petriuov OR (peteruo OR petriuuuo)) OR petriio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuv OR petrv) OR (((petriuov OR (peteruo OR petriuuuo)) OR petriio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuv OR petrv) OR (((petriuov OR (peteruo OR petriuuuo)) OR petriio) OR petr)) o.s.*.