Perhaps you should try some spelling variations:
petriv » peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petruuiiv » peteruuiiv (Expand Search), petruuuiiv (Expand Search), petrouuiiv (Expand Search)
petrou » peterou (Expand Search), petruou (Expand Search), petroou (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petroui » peteroui (Expand Search), petruoui (Expand Search), petrooui (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 ((peterov OR (petriv OR petruuiiv)) OR (((petrou OR pero) OR (petri OR petroui)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterov OR (petriv OR petruuiiv)) OR (((petrou OR pero) OR (petri OR petroui)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peterov OR (petriv OR petruuiiv)) OR (((petrou OR pero) OR (petri OR petroui)) OR petr)) o.s.*.