Perhaps you should try some spelling variations:
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search), petro (Expand Search), petrov (Expand Search), petrow (Expand Search)
petrioi » peterioi (Expand Search), petruioi (Expand Search), petroioi (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), petroui (Expand Search), petru (Expand Search)
petrooi » peterooi (Expand Search), petruooi (Expand Search), petroooi (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR peteru) OR (((petroi OR petrioi) OR (petri OR petrui)) OR petrooi)) _. s.~".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR peteru) OR (((petroi OR petrioi) OR (petri OR petrui)) OR petrooi)) _. s.*.