Perhaps you should try some spelling variations:
petrooov » petrov (Expand Search), peterooov (Expand Search), petruooov (Expand Search), petroooov (Expand Search)
peteruov » petrov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruuo » peteruuo (Expand Search), petruuuo (Expand Search), petrouuo (Expand Search)
petrouuo » peterouuo (Expand Search), petruouuo (Expand Search), petroouuo (Expand Search)
petr » peter (Expand Search), petru (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 ((petrooov OR peteruov) OR ((petri OR ((petruuo OR petrouuo) OR peteruo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrooov OR peteruov) OR ((petri OR ((petruuo OR petrouuo) OR peteruo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrooov OR peteruov) OR ((petri OR ((petruuo OR petrouuo) OR peteruo)) OR petr)) o.s.*.