Perhaps you should try some spelling variations:
petrooov » petrov (Expand Search), peterooov (Expand Search), petriooov (Expand Search), petruooov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petroiv » peteroiv (Expand Search), petrioiv (Expand Search), petruoiv (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (Expand Search)
petrooiuo » peterooiuo (Expand Search), petriooiuo (Expand Search), petruooiuo (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 ((petrooov OR (petriv OR petroiv)) OR (((petriu OR peteru) OR petrooiuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrooov OR (petriv OR petroiv)) OR (((petriu OR peteru) OR petrooiuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrooov OR (petriv OR petroiv)) OR (((petriu OR peteru) OR petrooiuo) OR petr)) o.s.*.