Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petruuio » peteruuio (Expand Search), petriuuio (Expand Search), petruuuio (Expand Search)
petruuuio » peteruuuio (Expand Search), petriuuuio (Expand Search), petruuuuio (Expand Search)
petriiiio » peteriiiio (Expand Search), petriiiiio (Expand Search), petruiiiio (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 ((peteriuov OR petriov) OR (((petrio OR (petruuio OR petruuuio)) OR petriiiio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteriuov OR petriov) OR (((petrio OR (petruuio OR petruuuio)) OR petriiiio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peteriuov OR petriov) OR (((petrio OR (petruuio OR petruuuio)) OR petriiiio) OR petr)) o.s.*.