Perhaps you should try some spelling variations:
petris » petri (Expand Search), petriis (Expand Search), petruis (Expand Search), petrois (Expand Search)
petruiiv » petriuiiv (Expand Search), petruuiiv (Expand Search), petrouiiv (Expand Search)
petruuo » petriuuo (Expand Search), petruuuo (Expand Search), petrouuo (Expand Search)
petrouo » petriouo (Expand Search), petruouo (Expand Search), petroouo (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 petruiiv) OR (((petruuo OR petrouo) OR petruiu) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petris OR petruiiv) OR (((petruuo OR petrouo) OR petruiu) OR (petr OR peter))) o.s.*".