Perhaps you should try some spelling variations:
petriiiv » peteriiiv (Expand Search), petruiiiv (Expand Search), petroiiiv (Expand Search)
petruiiv » peteruiiv (Expand Search), petruuiiv (Expand Search), petrouiiv (Expand Search)
petrv » peterv (Expand Search), petruv (Expand Search), petrov (Expand Search)
petruv » peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petriv » peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 (((petriiiv OR petruiiv) OR ((petrv OR petruv) OR petriv)) OR (petri OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriiiv OR petruiiv) OR ((petrv OR petruv) OR petriv)) OR (petri OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriiiv OR petruiiv) OR ((petrv OR petruv) OR petriv)) OR (petri OR petr)) o.s.*.