Perhaps you should try some spelling variations:
petriow » petrow (Expand Search), petriiow (Expand Search), petroiow (Expand Search), periow (Expand Search)
petru » pentru (Expand Search), petri (Expand Search), petriu (Expand Search), petrou (Expand Search), peru (Expand Search)
petrov » petro (Expand Search), petriov (Expand Search), petroov (Expand Search), perov (Expand Search)
petroi » petri (Expand Search), petro (Expand Search), petrow (Expand Search), petrioi (Expand Search), petrooi (Expand Search), peroi (Expand Search)
petrivw » petriivw (Expand Search), petroivw (Expand Search), perivw (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (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 ((((petriow OR (petru OR petrov)) OR petrivw) o) OR ((petroi OR (petr OR peter)) _)). s.~".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriow OR (petru OR petrov)) OR petrivw) o) OR ((petroi OR (petr OR peter)) _)). s.*.