Perhaps you should try some spelling variations:
petrioiov » peterioiov (Expand Search), petriioiov (Expand Search), petruioiov (Expand Search)
petriouiov » peteriouiov (Expand Search), petriiouiov (Expand Search), petruiouiov (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petruou » peteruou (Expand Search), petriuou (Expand Search), petruuou (Expand Search)
petriuo » peteriuo (Expand Search), petriiuo (Expand Search), petruiuo (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 ((petrioiov OR petriouiov) OR ((((petrou OR petruou) OR peteru) OR petriuo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrioiov OR petriouiov) OR ((((petrou OR petruou) OR peteru) OR petriuo) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrioiov OR petriouiov) OR ((((petrou OR petruou) OR peteru) OR petriuo) OR petr)) o.s.*.