Perhaps you should try some spelling variations:
petruw » peteruw (Expand Search), petriuw (Expand Search), petruuw (Expand Search)
petrow » peterow (Expand Search), petriow (Expand Search), petruow (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petrov » peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (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 (((((petruw OR petrow) OR perow) OR petr) o) OR (((petrov OR petrio) OR petrui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((((petruw OR petrow) OR perow) OR petr) o) OR (((petrov OR petrio) OR petrui) _)). s.*".