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