Perhaps you should try some spelling variations:
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (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)
peteri » peter (Expand Search), petri (Expand Search), peters (Expand Search)
peteriiov » peteriov (Expand Search), petriiov (Expand Search), petersiov (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((petr OR (peteri OR peterdi)) OR ((petriov OR (peteriiov OR petrov)) OR petruov)) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR (peteri OR peterdi)) OR ((petriov OR (peteriiov OR petrov)) OR petruov)) _. s.*".