Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruo » petru (Expand Search), petro (Expand Search), petriuo (Expand Search), petruuo (Expand Search), petrouo (Expand Search)
petriio » petriiio (Expand Search), petruiio (Expand Search), petroiio (Expand Search)
petruuiu » petriuuiu (Expand Search), petruuuiu (Expand Search), petrouuiu (Expand Search)
petruiuo » petriuiuo (Expand Search), petruuiuo (Expand Search), petrouiuo (Expand Search)
petr » petri (Expand Search), petru (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 (petriov OR ((((petriio OR petruuiu) OR petruo) OR petruiuo) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR ((((petriio OR petruuiu) OR petruo) OR petruiuo) OR (petr OR peter))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriov OR ((((petriio OR petruuiu) OR petruo) OR petruiuo) OR (petr OR peter))) o.s.*.