Perhaps you should try some spelling variations:
peterouv » petrov (Expand Search)
petroouv » petrov (Expand Search), peteroouv (Expand Search), petrioouv (Expand Search), petruoouv (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petrouv » peterouv (Expand Search), petriouv (Expand Search), petruouv (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (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 ((petruv OR ((petrouv OR peterouv) OR petroouv)) OR ((petroi OR per) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruv OR ((petrouv OR peterouv) OR petroouv)) OR ((petroi OR per) OR petr)) o.s.*".