Perhaps you should try some spelling variations:
petroiv » petrov (Expand Search), peteroiv (Expand Search), petrooiv (Expand Search), peroiv (Expand Search)
petrv » petrov (Expand Search), petro (Expand Search), petra (Expand Search), peterv (Expand Search), perv (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petruov » peteruov (Expand Search), petrouov (Expand Search), peruov (Expand Search), petrov (Expand Search), pentruov (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (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 ((petroiv OR (petrv OR petri)) OR (petr OR ((petruov OR petru) OR petroiv))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroiv OR (petrv OR petri)) OR (petr OR ((petruov OR petru) OR petroiv))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroiv OR (petrv OR petri)) OR (petr OR ((petruov OR petru) OR petroiv))) o.s.*.