Perhaps you should try some spelling variations:
petri » petroi (Expand Search), peri (Expand Search)
petr » petro (Expand Search), per (Expand Search)
petrou » petroou (Expand Search), perou (Expand Search), petro (Expand Search), petrov (Expand Search), petrow (Expand Search)
petruou » petrouou (Expand Search), peruou (Expand Search), pentruou (Expand Search)
petriu » petroiu (Expand Search), periu (Expand Search), petris (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petriiu » petroiiu (Expand Search), periiu (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop (petri OR ((petr OR ((petrou OR petruou) OR ((petriu OR petru) OR petriiu))) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petri OR ((petr OR ((petrou OR petruou) OR ((petriu OR petru) OR petriiu))) OR peter)) o.s.*".