Perhaps you should try some spelling variations:
peterv » peter (Expand Search), peters (Expand Search)
petroov » petrov (Expand Search), peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petrua » petru (Expand Search), petra (Expand Search), peterua (Expand Search), petruua (Expand Search), petroua (Expand Search)
petera » peter (Expand Search), peters (Expand Search), petra (Expand Search)
petroiv » petrov (Expand Search), peteroiv (Expand Search), petruoiv (Expand Search), petrooiv (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 ((((peterv OR petroov) OR (petrua OR petera)) OR petroiv) OR (petroov OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((peterv OR petroov) OR (petrua OR petera)) OR petroiv) OR (petroov OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((peterv OR petroov) OR (petrua OR petera)) OR petroiv) OR (petroov OR (petr OR petri))) o.s.*.