Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriioov » peteriioov (Expand Search), petriiioov (Expand Search), petruiioov (Expand Search)
petrioi » peterioi (Expand Search), petriioi (Expand Search), petruioi (Expand Search)
petriiiu » peteriiiu (Expand Search), petriiiiu (Expand Search), petruiiiu (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (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 petriioov) OR (((petrioi OR petriiiu) OR petruuo) OR (petr OR per))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR petriioov) OR (((petrioi OR petriiiu) OR petruuo) OR (petr OR per))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruov OR petriioov) OR (((petrioi OR petriiiu) OR petruuo) OR (petr OR per))) o.s.*.