Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petruuiov (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petruuiv (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (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 petruiov) OR (petriiv OR petruiv)) OR ((petero OR petrio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peteriov OR petruiov) OR (petriiv OR petruiv)) OR ((petero OR petrio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((peteriov OR petruiov) OR (petriiv OR petruiv)) OR ((petero OR petrio) OR petr)) o.s.*.