Perhaps you should try some spelling variations:
petroi » petro (Expand Search), petrov (Expand Search), petrow (Expand Search), peteroi (Expand Search), petrooi (Expand Search), peroi (Expand Search)
peteroi » peterdi (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petriuv » peteriuv (Expand Search), petroiuv (Expand Search), periuv (Expand Search)
petris » peteris (Expand Search), petrois (Expand Search), peris (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (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 ((periov OR petriuv) OR ((((petroi OR peteroi) OR petris) OR petru) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((periov OR petriuv) OR ((((petroi OR peteroi) OR petris) OR petru) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((periov OR petriuv) OR ((((petroi OR peteroi) OR petris) OR petru) OR (petr OR petri))) o.s.*.