Perhaps you should try some spelling variations:
petrouow » petrow (Expand Search), peterouow (Expand Search), petruouow (Expand Search), petroouow (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search)
petruoi » peteruoi (Expand Search), petruuoi (Expand Search), petrouoi (Expand Search)
petruuui » peteruuui (Expand Search), petruuuui (Expand Search), petrouuui (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 (((petrouow OR petr) o) OR ((((petri OR peteri) OR (petroi OR petruoi)) OR petruuui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petrouow OR petr) o) OR ((((petri OR peteri) OR (petroi OR petruoi)) OR petruuui) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petrouow OR petr) o) OR ((((petri OR peteri) OR (petroi OR petruoi)) OR petruuui) _)). s.*.