Perhaps you should try some spelling variations:
petrouiov » peterouiov (Expand Search), petruouiov (Expand Search), petroouiov (Expand Search)
petrov » peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrooi » peterooi (Expand Search), petruooi (Expand Search), petroooi (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 (((petrouiov OR petrov) OR petrov) OR (((petri OR petrooi) OR petruov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrouiov OR petrov) OR petrov) OR (((petri OR petrooi) OR petruov) OR petr)) o.s.*".