Perhaps you should try some spelling variations:
petrooov » petrov (Expand Search), peterooov (Expand Search), petruooov (Expand Search), petroooov (Expand Search)
petruooov » peteruooov (Expand Search), petruuooov (Expand Search), petrouooov (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petruouuuov » peteruouuuov (Expand Search), petruuouuuov (Expand Search), petrououuuov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (((peterov OR (petrooov OR petruooov)) OR (petruov OR petruouuuov)) OR (petri OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peterov OR (petrooov OR petruooov)) OR (petruov OR petruouuuov)) OR (petri OR petr)) o.s.*".