Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petroov » petrov (Expand Search), petrioov (Expand Search), petrooov (Expand Search), peroov (Expand Search)
petr » petri (Expand Search), petro (Expand Search), per (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search), petri (Expand Search)
petroi » petrioi (Expand Search), petrooi (Expand Search), peroi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
petrioi » petriioi (Expand Search), petroioi (Expand Search), perioi (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 (((periov OR peterov) OR petroov) OR (((petr OR petru) OR (petroi OR petrioi)) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((periov OR peterov) OR petroov) OR (((petr OR petru) OR (petroi OR petrioi)) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((periov OR peterov) OR petroov) OR (((petr OR petru) OR (petroi OR petrioi)) OR peter)) o.s.*.