Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), petriuov (Expand Search), petrouov (Expand Search), pentruov (Expand Search), petriov (Expand Search)
petr » petri (Expand Search), petro (Expand Search)
petru » petriu (Expand Search), petrou (Expand Search), pentru (Expand Search), petri (Expand Search)
petroi » petrioi (Expand Search), petrooi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
petruou » petriuou (Expand Search), petrouou (Expand Search), pentruou (Expand Search), petriou (Expand Search)
petriuou » petriiuou (Expand Search), petroiuou (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 (petruov OR ((((petr OR petru) OR per) OR (petroi OR (petruou OR petriuou))) OR peter)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petruov OR ((((petr OR petru) OR per) OR (petroi OR (petruou OR petriuou))) OR peter)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petruov OR ((((petr OR petru) OR per) OR (petroi OR (petruou OR petriuou))) OR peter)) o.s.*.