Perhaps you should try some spelling variations:
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petruioov (Expand Search)
petruoov » petrov (Expand Search), peteruoov (Expand Search), petriuoov (Expand Search), petruuoov (Expand Search)
petrooov » petrov (Expand Search), peterooov (Expand Search), petriooov (Expand Search), petruooov (Expand Search)
petriiuv » peteriiuv (Expand Search), petriiiuv (Expand Search), petruiiuv (Expand Search)
petruou » peteruou (Expand Search), petriuou (Expand Search), petruuou (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 petruoov) OR petrooov) OR peterov) OR petriiuv) OR (petruou OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petrioov OR petruoov) OR petrooov) OR peterov) OR petriiuv) OR (petruou OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((((petrioov OR petruoov) OR petrooov) OR peterov) OR petriiuv) OR (petruou OR petr)) o.s.*.