Perhaps you should try some spelling variations:
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruooi » peteruooi (Expand Search), petruuooi (Expand Search), petrouooi (Expand Search)
petriov » peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petrov » peterov (Expand Search), petruov (Expand Search), petroov (Expand Search), petro (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (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 (petri OR petruooi)) OR (petriov OR (petrov OR petruov))) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR (petri OR petruooi)) OR (petriov OR (petrov OR petruov))) _. s.*".