Perhaps you should try some spelling variations:
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
petruiiiv » peteruiiiv (Expand Search), petriuiiiv (Expand Search), petruuiiiv (Expand Search)
petruo » peteruo (Expand Search), petriuo (Expand Search), petruuo (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petruiio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 (((petruov OR (petriv OR petruiiiv)) OR peteruuv) OR ((petruo OR petriio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR (petriv OR petruiiiv)) OR peteruuv) OR ((petruo OR petriio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR (petriv OR petruiiiv)) OR peteruuv) OR ((petruo OR petriio) OR petr)) o.s.*.