Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petriiov (Expand Search), petroiov (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (Expand Search)
peterov » petrov (Expand Search), peterv (Expand Search), petersv (Expand Search)
peteroi » peterdi (Expand Search), peteri (Expand Search), petersi (Expand Search), petroi (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (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 (peruuov OR ((((((petriov OR petru) OR petr) OR peterov) OR peteroi) OR petero) OR per)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peruuov OR ((((((petriov OR petru) OR petr) OR peterov) OR peteroi) OR petero) OR per)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (peruuov OR ((((((petriov OR petru) OR petr) OR peterov) OR peteroi) OR petero) OR per)) o.s.*.