Perhaps you should try some spelling variations:
peteruov » petrov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruuuo » peteruuuo (Expand Search), petriuuuo (Expand Search), petruuuuo (Expand Search)
petriuuuo » peteriuuuo (Expand Search), petriiuuuo (Expand Search), petruiuuuo (Expand Search)
petruiuo » peteruiuo (Expand Search), petriuiuo (Expand Search), petruuiuo (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 (((petriov OR petriov) OR peteruov) OR (((petruuuo OR petriuuuo) OR petruiuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR petriov) OR peteruov) OR (((petruuuo OR petriuuuo) OR petruiuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR petriov) OR peteruov) OR (((petruuuo OR petriuuuo) OR petruiuo) OR petr)) o.s.*.