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)
petroi » peteroi (Expand Search), petrioi (Expand Search), petrooi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
petriooi » peteriooi (Expand Search), petriiooi (Expand Search), petroiooi (Expand Search)
petroooi » peteroooi (Expand Search), petrioooi (Expand Search), petrooooi (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 (((petroi OR petriooi) OR peteroi) OR (petriooi OR petroooi))) _. s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petr OR petru) OR (((petroi OR petriooi) OR peteroi) OR (petriooi OR petroooi))) _. s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petr OR petru) OR (((petroi OR petriooi) OR peteroi) OR (petriooi OR petroooi))) _. s.*.