Perhaps you should try some spelling variations:
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petrouiov » peterouiov (Expand Search), petriouiov (Expand Search), petruouiov (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petroiouo » peteroiouo (Expand Search), petrioiouo (Expand Search), petruoiouo (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 peteriiov) OR (petrouiov OR petroov)) OR ((petrou OR petroiouo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petriov OR peteriiov) OR (petrouiov OR petroov)) OR ((petrou OR petroiouo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petriov OR peteriiov) OR (petrouiov OR petroov)) OR ((petrou OR petroiouo) OR petr)) o.s.*.