Perhaps you should try some spelling variations:
petriiv » peteriiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petrouuo » peterouuo (Expand Search), petruouuo (Expand Search), petroouuo (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((peteriv OR petriiv) OR ((((petruov OR petrouuo) OR petri) OR petrio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriv OR petriiv) OR ((((petruov OR petrouuo) OR petri) OR petrio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteriv OR petriiv) OR ((((petruov OR petrouuo) OR petri) OR petrio) OR petr)) o.s.*.