Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petroiv » peteroiv (Expand Search), petrioiv (Expand Search), petruoiv (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (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 (((peteriov OR petriiov) OR (petroiv OR peteruiiv)) OR ((petriu OR petriio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peteriov OR petriiov) OR (petroiv OR peteruiiv)) OR ((petriu OR petriio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((peteriov OR petriiov) OR (petroiv OR peteruiiv)) OR ((petriu OR petriio) OR petr)) o.s.*.