Perhaps you should try some spelling variations:
petruow » petrow (Expand Search), peteruow (Expand Search), petruuow (Expand Search), petrouow (Expand Search)
peterow » petrow (Expand Search)
petriouow » peteriouow (Expand Search), petruiouow (Expand Search), petroiouow (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), petro (Expand Search), petrov (Expand Search), petrow (Expand Search)
petruui » peteruui (Expand Search), petruuui (Expand Search), petrouui (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 ((((petruow OR (petriouow OR peterow)) OR (petr OR petri)) o) OR ((petroi OR petruui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruow OR (petriouow OR peterow)) OR (petr OR petri)) o) OR ((petroi OR petruui) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruow OR (petriouow OR peterow)) OR (petr OR petri)) o) OR ((petroi OR petruui) _)). s.*.