Perhaps you should try some spelling variations:
petrouov » petrov (Expand Search), peterouov (Expand Search), petriouov (Expand Search), petruouov (Expand Search)
peterooi » peterdi (Expand Search)
peri » petri (Expand Search), per (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroouov » peteroouov (Expand Search), petrioouov (Expand Search), petruoouov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)

Try widening your search to All Fields.

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 (petrouov OR petroouov)) OR (((petroi OR peterooi) OR peri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR (petrouov OR petroouov)) OR (((petroi OR peterooi) OR peri) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruov OR (petrouov OR petroouov)) OR (((petroi OR peterooi) OR peri) OR petr)) o.s.*.