Perhaps you should try some spelling variations:
petriiv » peteriiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petruuo » peteruuo (Expand Search), petruuuo (Expand Search), petrouuo (Expand Search)
petruuuo » peteruuuo (Expand Search), petruuuuo (Expand Search), petrouuuo (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search), petrov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (petriiv OR ((((petr OR (petruuo OR petruuuo)) OR peterio) OR petruov) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriiv OR ((((petr OR (petruuo OR petruuuo)) OR peterio) OR petruov) OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriiv OR ((((petr OR (petruuo OR petruuuo)) OR peterio) OR petruov) OR petri)) o.s.*.