Perhaps you should try some spelling variations:
petrio » petro (Expand Search), petroio (Expand Search), perio (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petriiv » petroiiv (Expand Search), periiv (Expand Search)
petriiiv » petroiiiv (Expand Search), periiiv (Expand Search)
petris » petrois (Expand Search), peris (Expand Search)
petr » petro (Expand Search), per (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (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 ((petri OR (petriiv OR petriiiv)) OR ((petrio OR petris) OR ((petr OR petru) OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petri OR (petriiv OR petriiiv)) OR ((petrio OR petris) OR ((petr OR petru) OR peter))) o.s.*".