Perhaps you should try some spelling variations:
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search), petri (Expand Search)
petriov » petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search), petrov (Expand Search)
petruov » petriuov (Expand Search), petrouov (Expand Search), peruov (Expand Search), pentruov (Expand Search), petriov (Expand Search), petrov (Expand Search)
peteri » peterdi (Expand Search), petri (Expand Search), peters (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 petru) OR peter) OR peteri) OR (petriov OR petruov)) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petr OR petru) OR peter) OR peteri) OR (petriov OR petruov)) _. s.*".