Perhaps you should try some spelling variations:
petriow » petrow (Expand Search), peteriow (Expand Search), petriiow (Expand Search), petruiow (Expand Search)
peterow » petrow (Expand Search), peterw (Expand Search), petersw (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petruuuo » peteruuuo (Expand Search), petriuuuo (Expand Search), petruuuuo (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search), petri (Expand Search), petru (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (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 ((((petriow OR (peterow OR petriow)) OR (petr OR petero)) o) OR ((petruuuo OR petrui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriow OR (peterow OR petriow)) OR (petr OR petero)) o) OR ((petruuuo OR petrui) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriow OR (peterow OR petriow)) OR (petr OR petero)) o) OR ((petruuuo OR petrui) _)). s.*.