Perhaps you should try some spelling variations:
petriw » petri (Expand Search), petris (Expand Search), petrow (Expand Search), petriiw (Expand Search), petroiw (Expand Search), periw (Expand Search)
petrov » petro (Expand Search), petriov (Expand Search), petroov (Expand Search), perov (Expand Search)
petriov » petriiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search), petri (Expand Search)
peteru » 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 (((petriw OR (petriov OR petrov)) o) OR (((petr OR (peteru OR peter)) OR petru) _)). s.~".
• Adding a wildcard symbol may retrieve word variants: fop (((petriw OR (petriov OR petrov)) o) OR (((petr OR (peteru OR peter)) OR petru) _)). s.*.