Perhaps you should try some spelling variations:
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), petroui (Expand Search), petru (Expand Search)
petrov » peterov (Expand Search), petruov (Expand Search), petroov (Expand Search), petro (Expand Search)
petrooi » peterooi (Expand Search), petruooi (Expand Search), petroooi (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
peteroi » peterdi (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 ((petrui OR petrov) OR ((petrooi OR petri) OR peteroi))) _. s.~".
• Adding a wildcard symbol may retrieve word variants: fop (petr OR ((petrui OR petrov) OR ((petrooi OR petri) OR peteroi))) _. s.*.