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)
petriuov » peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
petruuov » peteruuov (Expand Search), petriuuov (Expand Search), petruuuov (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), petri (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 peteri) OR (((petrov OR petruov) OR petriuov) OR (petriuov OR petruuov))) _. s.~".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR peteri) OR (((petrov OR petruov) OR petriuov) OR (petriuov OR petruuov))) _. s.*.