Perhaps you should try some spelling variations:
peru » petru (Expand Search), per (Expand Search)
petriov » peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruiv » peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petruuiv » peteruuiv (Expand Search), petruuuiv (Expand Search), petrouuiv (Expand Search)
petriiv » peteriiv (Expand Search), petruiiv (Expand Search), petroiiv (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 ((petriov OR ((petruiv OR petruuiv) OR petriiv)) OR (((petri OR pero) OR peru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR ((petruiv OR petruuiv) OR petriiv)) OR (((petri OR pero) OR peru) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR ((petruiv OR petruuiv) OR petriiv)) OR (((petri OR pero) OR peru) OR petr)) o.s.*.