Perhaps you should try some spelling variations:
peteriov » petrov (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petruoi » peteruoi (Expand Search), petriuoi (Expand Search), petruuoi (Expand Search)
petruioi » peteruioi (Expand Search), petriuioi (Expand Search), petruuioi (Expand Search)
petriuuio » peteriuuio (Expand Search), petriiuuio (Expand Search), petruiuuio (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 peteriov) OR (((petruoi OR petruioi) OR petriuuio) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR peteriov) OR (((petruoi OR petruioi) OR petriuuio) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR peteriov) OR (((petruoi OR petruioi) OR petriuuio) OR petr)) o.s.*.