Perhaps you should try some spelling variations:
perov » petrov (Expand Search)
petroiov » petrov (Expand Search), peteroiov (Expand Search), petrioiov (Expand Search), petrooiov (Expand Search)
peteriov » petrov (Expand Search)
petriv » peteriv (Expand Search), petriiv (Expand Search), petroiv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petrooi (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 (petriv OR (((petru OR petroi) OR (perov OR ((petroiov OR peteriov) OR periov))) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriv OR (((petru OR petroi) OR (perov OR ((petroiov OR peteriov) OR periov))) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriv OR (((petru OR petroi) OR (perov OR ((petroiov OR peteriov) OR periov))) OR petr)) o.s.*.