Perhaps you should try some spelling variations:
petre » petru (Expand Search), petro (Expand Search), petra (Expand Search), petrue (Expand Search), petroe (Expand Search), pere (Expand Search)
petrie » petris (Expand Search), patrie (Expand Search), petruie (Expand Search), petroie (Expand Search), perie (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (Expand Search)
petruov » petruuov (Expand Search), petrouov (Expand Search), peruov (Expand Search), petrov (Expand Search)
petrou » petruou (Expand Search), petroou (Expand Search), perou (Expand Search), petru (Expand Search), petro (Expand Search), petrov (Expand Search)
petrooi » petruooi (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 petri) OR petrie) OR petr) OR petruov) OR ((petrou OR petrooi) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petre OR petri) OR petrie) OR petr) OR petruov) OR ((petrou OR petrooi) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((((petre OR petri) OR petrie) OR petr) OR petruov) OR ((petrou OR petrooi) OR peter)) o.s.*.