Perhaps you should try some spelling variations:
petrooov » petrov (Expand Search), peterooov (Expand Search), petruooov (Expand Search), petroooov (Expand Search)
peteroov » petrov (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrouuiuo » peterouuiuo (Expand Search), petruouuiuo (Expand Search), petroouuiuo (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 ((petruov OR (petrooov OR peteroov)) OR ((petri OR (petrouuiuo OR peteruuiuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR (petrooov OR peteroov)) OR ((petri OR (petrouuiuo OR peteruuiuo)) OR petr)) o.s.*".