Perhaps you should try some spelling variations:
petr » petro (Expand Search), per (Expand Search)
petri » petroi (Expand Search), peri (Expand Search)
petru » petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petrou » petroou (Expand Search), perou (Expand Search), petro (Expand Search), petrow (Expand Search)
petriou » petroiou (Expand Search), periou (Expand Search)
petrov » petroov (Expand Search), perov (Expand Search), petro (Expand Search)
petriov » petroiov (Expand Search), periov (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 (((petr OR petri) OR peter) OR (petru OR ((petrou OR petriou) OR (petrov OR petriov)))) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petr OR petri) OR peter) OR (petru OR ((petrou OR petriou) OR (petrov OR petriov)))) _. s.*".