Perhaps you should try some spelling variations:
petrw » petrow (Expand Search), petro (Expand Search), petra (Expand Search), peterw (Expand Search), perw (Expand Search)
peterow » petrow (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search), pentru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petrui » peterui (Expand Search), petroui (Expand Search), perui (Expand Search), pentrui (Expand Search)

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 peterow) OR peterow) o) OR ((((petr OR petru) OR petri) OR petrui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrw OR peterow) OR peterow) o) OR ((((petr OR petru) OR petri) OR petrui) _)). s.*".