Perhaps you should try some spelling variations:
petris » petri (Expand Search), petriis (Expand Search), petruis (Expand Search), petrois (Expand Search)
petruiv » petriuiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petruiiv » petriuiiv (Expand Search), petruuiiv (Expand Search), petrouiiv (Expand Search)
petriuo » petriiuo (Expand Search), petruiuo (Expand Search), petroiuo (Expand Search)
petriiu » petriiiu (Expand Search), petruiiu (Expand Search), petroiiu (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 petruiv) OR petruiiv) OR ((petriuo OR petriiu) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petris OR petruiv) OR petruiiv) OR ((petriuo OR petriiu) OR (petr OR peter))) o.s.*".