Perhaps you should try some spelling variations:
petrw » petrow (Expand Search), petri (Expand Search), petru (Expand Search), peterw (Expand Search), petriw (Expand Search), petruw (Expand Search)
petriov » petrov (Expand Search), peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
peterow » petrow (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search), petri (Expand Search), petru (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), petri (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 petriov) OR peterow) OR peterow) o) OR (((petr OR peteri) OR petrui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petrw OR petriov) OR peterow) OR peterow) o) OR (((petr OR peteri) OR petrui) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((((petrw OR petriov) OR peterow) OR peterow) o) OR (((petr OR peteri) OR petrui) _)). s.*.