Perhaps you should try some spelling variations:
petruow » petrow (Expand Search), peteruow (Expand Search), petriuow (Expand Search), petruuow (Expand Search)
petruio » peteruio (Expand Search), petriuio (Expand Search), petruuio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search), petri (Expand Search), petro (Expand Search), petrov (Expand Search)
petriiu » peteriiu (Expand Search), petriiiu (Expand Search), petruiiu (Expand Search)
petroiu » peteroiu (Expand Search), petrioiu (Expand Search), petruoiu (Expand Search), petriu (Expand Search), petrou (Expand Search), petrovu (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 (((petruow OR petruio) o) OR (((petr OR petroi) OR (petriiu OR petroiu)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruow OR petruio) o) OR (((petr OR petroi) OR (petriiu OR petroiu)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruow OR petruio) o) OR (((petr OR petroi) OR (petriiu OR petroiu)) _)). s.*.