Perhaps you should try some spelling variations:
petruow » peteruow (Expand Search), petriuow (Expand Search), petruuow (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petruuo » peteruuo (Expand Search), petriuuo (Expand Search), petruuuo (Expand Search)
petruuuuo » peteruuuuo (Expand Search), petriuuuuo (Expand Search), petruuuuuo (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (Expand Search)
petruui » peteruui (Expand Search), petriuui (Expand Search), petruuui (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 petr) o) OR (((petruuo OR petruuuuo) OR ((petrui OR petriui) OR petruui)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruow OR petr) o) OR (((petruuo OR petruuuuo) OR ((petrui OR petriui) OR petruui)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruow OR petr) o) OR (((petruuo OR petruuuuo) OR ((petrui OR petriui) OR petruui)) _)). s.*.