Perhaps you should try some spelling variations:
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petrov » peterov (Expand Search), petriov (Expand Search), petruov (Expand Search), petro (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petrv » peterv (Expand Search), petriv (Expand Search), petruv (Expand Search), petri (Expand Search), petru (Expand Search), petro (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
peterv » 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 (petr OR ((petrov OR petruov) OR ((petrv OR peterv) OR petriiv))) _. s.~".
• Adding a wildcard symbol may retrieve word variants: fop (petr OR ((petrov OR petruov) OR ((petrv OR peterv) OR petriiv))) _. s.*.