Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), pentruov (Expand Search), petriov (Expand Search), petriuov (Expand Search), petrouov (Expand Search), peruov (Expand Search)
petruv » petrov (Expand Search), pentruv (Expand Search), petriv (Expand Search), petriuv (Expand Search), petrouv (Expand Search), peruv (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petriuuo » petriiuuo (Expand Search), petroiuuo (Expand Search), periuuo (Expand Search)
petriuuuuo » petriiuuuuo (Expand Search), petroiuuuuo (Expand Search), periuuuuo (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (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 petruv) OR ((petru OR (petriuuo OR petriuuuuo)) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR petruv) OR ((petru OR (petriuuo OR petriuuuuo)) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruov OR petruv) OR ((petru OR (petriuuo OR petriuuuuo)) OR (petr OR peter))) o.s.*.