Perhaps you should try some spelling variations:
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petrouiov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petrouov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petrooi (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petriio » peteriio (Expand Search), petriiio (Expand Search), petroiio (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 (((periv OR petruiov) OR petruov) OR ((((petroi OR petru) OR petriio) OR petero) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((periv OR petruiov) OR petruov) OR ((((petroi OR petru) OR petriio) OR petero) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((periv OR petruiov) OR petruov) OR ((((petroi OR petru) OR petriio) OR petero) OR petr)) o.s.*.