Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petruov » petrov (Expand Search), petriuov (Expand Search), petrouov (Expand Search), peruov (Expand Search), pentruov (Expand Search), petriov (Expand Search)
petriv » petri (Expand Search), petris (Expand Search), petrov (Expand Search), petriiv (Expand Search), petroiv (Expand Search), periv (Expand Search)
petruiv » petriuiv (Expand Search), petrouiv (Expand Search), peruiv (Expand Search), pentruiv (Expand Search), petriiv (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search), petri (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 ((((peterov OR petruov) OR petruiv) OR petriv) OR ((petr OR petru) OR (peter OR peterdi))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((peterov OR petruov) OR petruiv) OR petriv) OR ((petr OR petru) OR (peter OR peterdi))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((peterov OR petruov) OR petruiv) OR petriv) OR ((petr OR petru) OR (peter OR peterdi))) o.s.*.