Perhaps you should try some spelling variations:
petruiiv » peteruiiv (Expand Search), petruuiiv (Expand Search), petrouiiv (Expand Search)
petriiiv » peteriiiv (Expand Search), petruiiiv (Expand Search), petroiiiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruo » peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search)
petriuuo » peteriuuo (Expand Search), petruiuuo (Expand Search), petroiuuo (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 ((petruiiv OR petriiiv) OR (((petri OR (petruo OR peteruo)) OR petriuuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruiiv OR petriiiv) OR (((petri OR (petruo OR peteruo)) OR petriuuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruiiv OR petriiiv) OR (((petri OR (petruo OR peteruo)) OR petriuuo) OR petr)) o.s.*.