Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petruiuov » pentruiuov (Expand Search), petriiuov (Expand Search), petriuiuov (Expand Search), petrouiuov (Expand Search), peruiuov (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petruiuo » pentruiuo (Expand Search), petriiuo (Expand Search), petriuiuo (Expand Search), petrouiuo (Expand Search), peruiuo (Expand Search)
petriiuuo » petriiiuuo (Expand Search), petroiiuuo (Expand Search), periiuuo (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (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 (((petriov OR petruiuov) OR petru) OR ((petruiuo OR petriiuuo) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR petruiuov) OR petru) OR ((petruiuo OR petriiuuo) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR petruiuov) OR petru) OR ((petruiuo OR petriiuuo) OR (petr OR peter))) o.s.*.