Perhaps you should try some spelling variations:
petre » petri (Expand Search), petro (Expand Search), petra (Expand Search), petrie (Expand Search), petroe (Expand Search), pere (Expand Search)
petris » petri (Expand Search), petriis (Expand Search), petrois (Expand Search), peris (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petroov » petrioov (Expand Search), petrooov (Expand Search), peroov (Expand Search), petrov (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search), petri (Expand Search)
petriu » petriiu (Expand Search), petroiu (Expand Search), periu (Expand Search), petri (Expand Search)
petrooi » petriooi (Expand Search), petroooi (Expand Search), perooi (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 ((((petre OR petris) OR petr) OR petroov) OR (((petru OR petriu) OR petrooi) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petre OR petris) OR petr) OR petroov) OR (((petru OR petriu) OR petrooi) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petre OR petris) OR petr) OR petroov) OR (((petru OR petriu) OR petrooi) OR peter)) o.s.*.