Perhaps you should try some spelling variations:
petris » petri (Expand Search), petriis (Expand Search), petrois (Expand Search), peris (Expand Search)
petroi » petri (Expand Search), petro (Expand Search), petrov (Expand Search), petrioi (Expand Search), petrooi (Expand Search), peroi (Expand Search)
petruiv » pentruiv (Expand Search), petriiv (Expand Search), petriuiv (Expand Search), petrouiv (Expand Search), peruiv (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petrou » petro (Expand Search), petrov (Expand Search), petrow (Expand Search), petriou (Expand Search), petroou (Expand Search), perou (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 ((petruiv OR petris) OR (((petroi OR (petru OR petrou)) OR peteruo) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruiv OR petris) OR (((petroi OR (petru OR petrou)) OR peteruo) OR (petr OR peter))) o.s.*".