Perhaps you should try some spelling variations:
petero » peters (Expand Search), petro (Expand Search)
petroi » petro (Expand Search), petrov (Expand Search), petrow (Expand Search), petrooi (Expand Search), peroi (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petruiv » petrouiv (Expand Search), peruiv (Expand Search), pentruiv (Expand Search)
petriuo » petroiuo (Expand Search), periuo (Expand Search)
petr » petro (Expand Search), per (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (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 ((petri OR petruiv) OR (((petero OR petroi) OR petriuo) OR ((petr OR petru) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petri OR petruiv) OR (((petero OR petroi) OR petriuo) OR ((petr OR petru) OR peter))) o.s.*".