Perhaps you should try some spelling variations:
petr » peter (Expand Search), petri (Expand Search), petro (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petrooi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search), pentru (Expand Search), petri (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petrouov (Expand Search), pentruov (Expand Search), petriov (Expand Search), petrov (Expand Search)
peterov » petrov (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 (periv OR ((((petr OR petroi) OR petru) OR (petruov OR peterov)) OR periv)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (periv OR ((((petr OR petroi) OR petru) OR (petruov OR peterov)) OR periv)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (periv OR ((((petr OR petroi) OR petru) OR (petruov OR peterov)) OR periv)) o.s.*.