Perhaps you should try some spelling variations:
peterioi » peterdi (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petruuiv » peteruuiv (Expand Search), petriuuiv (Expand Search), petruuuiv (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (Expand Search)
petriuuuo » peteriuuuo (Expand Search), petriiuuuo (Expand Search), petruiuuuo (Expand Search)
petriioi » peteriioi (Expand Search), petriiioi (Expand Search), petruiioi (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 petruuiv) OR (((petruo OR petriuuuo) OR (peterioi OR petriioi)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiv OR petruuiv) OR (((petruo OR petriuuuo) OR (peterioi OR petriioi)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiv OR petruuiv) OR (((petruo OR petriuuuo) OR (peterioi OR petriioi)) OR petr)) o.s.*.