Perhaps you should try some spelling variations:
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petruiiiu » peteruiiiu (Expand Search), petriuiiiu (Expand Search), petruuiiiu (Expand Search)
petruuiiu » peteruuiiu (Expand Search), petriuuiiu (Expand Search), petruuuiiu (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 (petriiv OR ((((petriu OR petruiiiu) OR (petruiiiu OR petruuiiu)) OR petrio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriiv OR ((((petriu OR petruiiiu) OR (petruiiiu OR petruuiiu)) OR petrio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriiv OR ((((petriu OR petruiiiu) OR (petruiiiu OR petruuiiu)) OR petrio) OR petr)) o.s.*.