Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), peterou (Expand Search), petruou (Expand Search), petroou (Expand Search)
petrouuo » petruuo (Expand Search), petrouo (Expand Search), petrovuo (Expand Search), peterouuo (Expand Search), petruouuo (Expand Search), petroouuo (Expand Search)
petriuuv » peteriuuv (Expand Search), petruiuuv (Expand Search), petroiuuv (Expand Search)
petruuuo » peteruuuo (Expand Search), petruuuuo (Expand Search), petrouuuo (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petriuuv OR peterov) OR ((petrou OR (petruuuo OR petrouuo)) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuuv OR peterov) OR ((petrou OR (petruuuo OR petrouuo)) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuuv OR peterov) OR ((petrou OR (petruuuo OR petrouuo)) OR (petr OR petri))) o.s.*.