Perhaps you should try some spelling variations:
petriiiiiv » peteriiiiiv (Expand Search), petriiiiiiv (Expand Search), petroiiiiiv (Expand Search)
petruiiiiv » peteruiiiiv (Expand Search), petriuiiiiv (Expand Search), petrouiiiiv (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petroio » peteroio (Expand Search), petrioio (Expand Search), petrooio (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petrouov (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 ((peterdi OR (petriiiiiv OR petruiiiiv)) OR (((petru OR petroio) OR petruov) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peterdi OR (petriiiiiv OR petruiiiiv)) OR (((petru OR petroio) OR petruov) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((peterdi OR (petriiiiiv OR petruiiiiv)) OR (((petru OR petroio) OR petruov) OR petr)) o.s.*.