Perhaps you should try some spelling variations:
peteroov » petrov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroouov » peteroouov (Expand Search), petrioouov (Expand Search), petruoouov (Expand Search)
petruuuov » peteruuuov (Expand Search), petriuuuov (Expand Search), petruuuuov (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (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 (((peterov OR peteroov) OR ((petruov OR petroouov) OR petruuuov)) OR (petrui OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peterov OR peteroov) OR ((petruov OR petroouov) OR petruuuov)) OR (petrui OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((peterov OR peteroov) OR ((petruov OR petroouov) OR petruuuov)) OR (petrui OR petr)) o.s.*.