Perhaps you should try some spelling variations:
petris » petri (Expand Search), petriis (Expand Search), petruis (Expand Search), petrois (Expand Search)
petrv » petrov (Expand Search), petri (Expand Search), petru (Expand Search), petriv (Expand Search), petruv (Expand Search)
petrou » petru (Expand Search), petro (Expand Search), petrov (Expand Search), petriou (Expand Search), petruou (Expand Search), petroou (Expand Search)
peris » paris (Expand Search)
petruoou » petriuoou (Expand Search), petruuoou (Expand Search), petrouoou (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (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 ((petris OR (petrv OR petrou)) OR (((petruoou OR petruoou) OR peris) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petris OR (petrv OR petrou)) OR (((petruoou OR petruoou) OR peris) OR (petr OR peter))) o.s.*".