Perhaps you should try some spelling variations:
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrooi » peterooi (Expand Search), petruooi (Expand Search), petroooi (Expand Search)
petroooi » peteroooi (Expand Search), petruoooi (Expand Search), petrooooi (Expand Search)
petriov » peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search), petrov (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search), petrov (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 (petrooi OR petroooi))) OR (petriov OR petruov)) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR (petri OR (petrooi OR petroooi))) OR (petriov OR petruov)) _. s.*".