Perhaps you should try some spelling variations:
peteroov » petrov (Expand Search)
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petruioov (Expand Search)
petruou » peteruou (Expand Search), petriuou (Expand Search), petruuou (Expand Search)
petruuuou » peteruuuou (Expand Search), petriuuuou (Expand Search), petruuuuou (Expand Search)
petriiu » peteriiu (Expand Search), petriiiu (Expand Search), petruiiu (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 ((peteroov OR petrioov) OR (((petruou OR (petruuuou OR peteruuou)) OR petriiu) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteroov OR petrioov) OR (((petruou OR (petruuuou OR peteruuou)) OR petriiu) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteroov OR petrioov) OR (((petruou OR (petruuuou OR peteruuou)) OR petriiu) OR petr)) o.s.*.