Perhaps you should try some spelling variations:
peru » petru (Expand Search), per (Expand Search)
petriiiv » peteriiiv (Expand Search), petriiiiv (Expand Search), petruiiiv (Expand Search)
petriiuiv » peteriiuiv (Expand Search), petriiiuiv (Expand Search), petruiiuiv (Expand Search)
petriuuiv » peteriuuiv (Expand Search), petriiuuiv (Expand Search), petruiuuiv (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petruiu (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 ((petriiiv OR ((petriiuiv OR peteriuiv) OR petriuuiv)) OR ((petriu OR peru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiiv OR ((petriiuiv OR peteriuiv) OR petriuuiv)) OR ((petriu OR peru) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiiv OR ((petriiuiv OR peteriuiv) OR petriuuiv)) OR ((petriu OR peru) OR petr)) o.s.*.