Perhaps you should try some spelling variations:
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petrov » peterov (Expand Search), petroov (Expand Search), perov (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petroi » peteroi (Expand Search), petrooi (Expand Search), peroi (Expand Search), petro (Expand Search), petrow (Expand Search)
pero » petro (Expand Search), per (Expand Search), pro (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 (petru OR (petrov OR pero))) OR (((petri OR petroi) OR peterdi) OR peterdi)) _. s.~".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR (petru OR (petrov OR pero))) OR (((petri OR petroi) OR peterdi) OR peterdi)) _. s.*.