Perhaps you should try some spelling variations:
petr » peter (Expand Search), petri (Expand Search), petro (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search), pentru (Expand Search), petri (Expand Search)
petrioi » peterioi (Expand Search), petriioi (Expand Search), petroioi (Expand Search)
petrooi » peterooi (Expand Search), petriooi (Expand Search), petroooi (Expand Search)
petroiooi » peteroiooi (Expand Search), petrioiooi (Expand Search), petrooiooi (Expand Search)
peteroi » peterdi (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 ((petr OR petru) OR (((petrioi OR peteroi) OR peteroi) OR (petrooi OR petroiooi))) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR petru) OR (((petrioi OR peteroi) OR peteroi) OR (petrooi OR petroiooi))) _. s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR petru) OR (((petrioi OR peteroi) OR peteroi) OR (petrooi OR petroiooi))) _. s.*.