Perhaps you should try some spelling variations:
petrw » peterw (Expand Search), petriw (Expand Search), petruw (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petro » petero (Expand Search), petrio (Expand Search), petruo (Expand Search), petrov (Expand Search), petri (Expand Search), petru (Expand Search)
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petruuiv (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petrv » peterv (Expand Search), petriv (Expand Search), petruv (Expand Search)
peri » petri (Expand Search), per (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 (((petrw OR petr) o) OR ((((petro OR pero) OR ((petruiv OR petruv) OR petrv)) OR peri) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrw OR petr) o) OR ((((petro OR pero) OR ((petruiv OR petruv) OR petrv)) OR peri) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petrw OR petr) o) OR ((((petro OR pero) OR ((petruiv OR petruv) OR petrv)) OR peri) _)). s.*.