Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petris » petri (Expand Search), petriis (Expand Search), petrois (Expand Search), peris (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petruo » pentruo (Expand Search), petrio (Expand Search), petro (Expand Search), petriuo (Expand Search), petrouo (Expand Search), peruo (Expand Search)
petruuo » pentruuo (Expand Search), petriuo (Expand Search), petriuuo (Expand Search), petrouuo (Expand Search), peruuo (Expand Search)
petero » peters (Expand Search), petro (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)

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 petris) OR (((petru OR petero) OR (petruo OR petruuo)) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petris) OR (((petru OR petero) OR (petruo OR petruuo)) OR (petr OR peter))) o.s.*".