Perhaps you should try some spelling variations:
peteroov » petrov (Expand Search)
petrooov » petrov (Expand Search), peterooov (Expand Search), petriooov (Expand Search), petruooov (Expand Search)
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petruuiov (Expand Search)
petriuo » peteriuo (Expand Search), petriiuo (Expand Search), petruiuo (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 (((peteroov OR petrooov) OR petruiov) OR (((peteruo OR petriuo) OR petrui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peteroov OR petrooov) OR petruiov) OR (((peteruo OR petriuo) OR petrui) OR petr)) o.s.*".