Perhaps you should try some spelling variations:
perov » petrov (Expand Search)
petrouiov » peterouiov (Expand Search), petriouiov (Expand Search), petroouiov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petrouov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petroio (Expand Search)
petriiio » peteriiio (Expand Search), petriiiio (Expand Search), petroiiio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 (((perov OR petrouiov) OR petruov) OR (((petru OR per) OR (petrio OR petriiio)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((perov OR petrouiov) OR petruov) OR (((petru OR per) OR (petrio OR petriiio)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((perov OR petrouiov) OR petruov) OR (((petru OR per) OR (petrio OR petriiio)) OR petr)) o.s.*.