Perhaps you should try some spelling variations:
petriiiiiv » peteriiiiiv (Expand Search), petriiiiiiv (Expand Search), petruiiiiiv (Expand Search)
petriiuiiv » peteriiuiiv (Expand Search), petriiiuiiv (Expand Search), petruiiuiiv (Expand Search)
petrv » peterv (Expand Search), petriv (Expand Search), petruv (Expand Search)
petruiiv » peteruiiv (Expand Search), petriuiiv (Expand Search), petruuiiv (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop (((petriiiiiv OR petriiuiiv) OR (petrv OR petruiiv)) OR (petrio OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriiiiiv OR petriiuiiv) OR (petrv OR petruiiv)) OR (petrio OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriiiiiv OR petriiuiiv) OR (petrv OR petruiiv)) OR (petrio OR petr)) o.s.*.