Perhaps you should try some spelling variations:
petris » petri (Expand Search), petriis (Expand Search), petruis (Expand Search), petrois (Expand Search)
petriiv » petriiiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petruiiiv » petriuiiiv (Expand Search), petruuiiiv (Expand Search), petrouiiiv (Expand Search)
petriuo » petriiuo (Expand Search), petruiuo (Expand Search), petroiuo (Expand Search)
petruiu » petriuiu (Expand Search), petruuiu (Expand Search), petrouiu (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 (petriiv OR petruiiiv)) OR ((petriuo OR petruiu) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petris OR (petriiv OR petruiiiv)) OR ((petriuo OR petruiu) OR (petr OR peter))) o.s.*".