Perhaps you should try some spelling variations:
petroi » peteroi (Expand Search), petrioi (Expand Search), petrooi (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petriuo » peteriuo (Expand Search), petriiuo (Expand Search), petroiuo (Expand Search)
petriiiiuo » peteriiiiuo (Expand Search), petriiiiiuo (Expand Search), petroiiiiuo (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petrouuo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 (peteruv OR (((petroi OR petru) OR ((petriuo OR petriiiiuo) OR petruuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peteruv OR (((petroi OR petru) OR ((petriuo OR petriiiiuo) OR petruuo)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (peteruv OR (((petroi OR petru) OR ((petriuo OR petriiiiuo) OR petruuo)) OR petr)) o.s.*.