Perhaps you should try some spelling variations:
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petruioov (Expand Search)
peterui » peterdi (Expand Search)
petruioov » peteruioov (Expand Search), petriuioov (Expand Search), petruuioov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (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 ((((petrioov OR petruioov) OR peterov) OR petriv) OR ((peterui OR petroi) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrioov OR petruioov) OR peterov) OR petriv) OR ((peterui OR petroi) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petrioov OR petruioov) OR peterov) OR petriv) OR ((peterui OR petroi) OR petr)) o.s.*.