Perhaps you should try some spelling variations:
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search)
petriv » peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petruio » peteruio (Expand Search), petruuio (Expand Search), petrouio (Expand Search)
petruuio » peteruuio (Expand Search), petruuuio (Expand Search), petrouuio (Expand Search)
petr » peter (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 (peteruiiv OR ((((petri OR petroi) OR petriv) OR (petruio OR petruuio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peteruiiv OR ((((petri OR petroi) OR petriv) OR (petruio OR petruuio)) OR petr)) o.s.*".