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)
petrov » peterov (Expand Search), petruov (Expand Search), petroov (Expand Search), petro (Expand Search)
petrooov » peterooov (Expand Search), petruooov (Expand Search), petroooov (Expand Search)
petruooov » peteruooov (Expand Search), petruuooov (Expand Search), petrouooov (Expand Search)
petriov » peteriov (Expand Search), petruiov (Expand Search), petroiov (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 petri) OR ((petrov OR (petrooov OR petruooov)) OR petriov)) _. s.~".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR petri) OR ((petrov OR (petrooov OR petruooov)) OR petriov)) _. s.*.