Perhaps you should try some spelling variations:
petrouov » petrov (Expand Search), peterouov (Expand Search), petruouov (Expand Search), petroouov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search)
petrooi » peterooi (Expand Search), petruooi (Expand Search), petroooi (Expand Search)
petrouo » peterouo (Expand Search), petruouo (Expand Search), petroouo (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 ((petrouov OR petrouov) OR (((petri OR (petroi OR petrooi)) OR petrouo) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouov OR petrouov) OR (((petri OR (petroi OR petrooi)) OR petrouo) OR petr)) o.s.*".