Perhaps you should try some spelling variations:
petrv » petrov (Expand Search), petri (Expand Search), petro (Expand Search), petriv (Expand Search), perv (Expand Search)
peterov » petrov (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)
petrouo » petriouo (Expand Search), petroouo (Expand Search), perouo (Expand Search)
petroi » petrioi (Expand Search), petrooi (Expand Search), peroi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
peteri » peterdi (Expand Search), petri (Expand Search), peters (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 ((petrv OR peterov) OR ((((petr OR petru) OR petrouo) OR (petroi OR peteri)) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrv OR peterov) OR ((((petr OR petru) OR petrouo) OR (petroi OR peteri)) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrv OR peterov) OR ((((petr OR petru) OR petrouo) OR (petroi OR peteri)) OR peter)) o.s.*.