Perhaps you should try some spelling variations:
petrioov » petrov (Expand Search), peterioov (Expand Search), petriioov (Expand Search), petruioov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petruuiuo » peteruuiuo (Expand Search), petriuuiuo (Expand Search), petruuuiuo (Expand Search)
petruuuiuo » peteruuuiuo (Expand Search), petriuuuiuo (Expand Search), petruuuuiuo (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 ((petruov OR petrioov) OR (((petroi OR petroi) OR (petruuiuo OR petruuuiuo)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR petrioov) OR (((petroi OR petroi) OR (petruuiuo OR petruuuiuo)) OR petr)) o.s.*".