Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petriiiov » peteriiiov (Expand Search), petruiiiov (Expand Search), petroiiiov (Expand Search)
petrouoiov » peterouoiov (Expand Search), petruouoiov (Expand Search), petroouoiov (Expand Search), petruoiov (Expand Search), petrooiov (Expand Search), petrovoiov (Expand Search)
petrioi » peterioi (Expand Search), petruioi (Expand Search), petroioi (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrou » peterou (Expand Search), petruou (Expand Search), petroou (Expand Search), petru (Expand Search), petro (Expand Search), petrov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((petriiiov OR petrouoiov) OR ((petrioi OR petriov) OR (petr OR (petrou OR petri)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriiiov OR petrouoiov) OR ((petrioi OR petriov) OR (petr OR (petrou OR petri)))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriiiov OR petrouoiov) OR ((petrioi OR petriov) OR (petr OR (petrou OR petri)))) o.s.*.