Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
peterow » petrow (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), petroui (Expand Search), petru (Expand Search)
peteri » peterdi (Expand Search), peter (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 (((((petri OR petriov) OR peterow) OR peterow) o) OR (((petr OR peteri) OR petrui) _)). s.~".
• Adding a wildcard symbol may retrieve word variants: fop (((((petri OR petriov) OR peterow) OR peterow) o) OR (((petr OR peteri) OR petrui) _)). s.*.