Perhaps you should try some spelling variations:
petriv » peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petruiv » peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search)
petrooi » peterooi (Expand Search), petruooi (Expand Search), petroooi (Expand Search)
petrio » peterio (Expand Search), petruio (Expand Search), petroio (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 ((petriv OR petruiv) OR (((petri OR (petroi OR petrooi)) OR petrio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriv OR petruiv) OR (((petri OR (petroi OR petrooi)) OR petrio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriv OR petruiv) OR (((petri OR (petroi OR petrooi)) OR petrio) OR petr)) o.s.*.