Perhaps you should try some spelling variations:
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)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petroiuo » peteroiuo (Expand Search), petrioiuo (Expand Search), petruoiuo (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 ((((petruoov OR peterov) OR petrooov) OR petriiv) OR ((petrou OR petroiuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruoov OR peterov) OR petrooov) OR petriiv) OR ((petrou OR petroiuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruoov OR peterov) OR petrooov) OR petriiv) OR ((petrou OR petroiuo) OR petr)) o.s.*.