Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
peterov » petrov (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (Expand Search)
petroouuo » peteroouuo (Expand Search), petrioouuo (Expand Search), petruoouuo (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 ((petruov OR peterov) OR ((petrou OR (petruuo OR petroouuo)) OR (petr OR peterdi))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR peterov) OR ((petrou OR (petruuo OR petroouuo)) OR (petr OR peterdi))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruov OR peterov) OR ((petrou OR (petruuo OR petroouuo)) OR (petr OR peterdi))) o.s.*.