Perhaps you should try some spelling variations:
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petroioov (Expand Search)
peterouv » petrov (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petroiuv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petriooou » peteriooou (Expand Search), petriiooou (Expand Search), petroiooou (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 ((petrioov OR (petriuv OR peterouv)) OR ((petru OR (petriooou OR petriooou)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrioov OR (petriuv OR peterouv)) OR ((petru OR (petriooou OR petriooou)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrioov OR (petriuv OR peterouv)) OR ((petru OR (petriooou OR petriooou)) OR petr)) o.s.*.