Perhaps you should try some spelling variations:
petris » petri (Expand Search), petriis (Expand Search), petruis (Expand Search), petrois (Expand Search)
petroov » petrov (Expand Search), petrioov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petriioiv » petriiioiv (Expand Search), petruiioiv (Expand Search), petroiioiv (Expand Search)
petruis » petriuis (Expand Search), petruuis (Expand Search), petrouis (Expand Search)
petruois » petriuois (Expand Search), petruuois (Expand Search), petrouois (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 ((petriioiv OR ((petris OR petruis) OR petruois)) OR (petroov OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriioiv OR ((petris OR petruis) OR petruois)) OR (petroov OR (petr OR peter))) o.s.*".