Perhaps you should try some spelling variations:
petruow » petrow (Expand Search), petriuow (Expand Search), petruuow (Expand Search), petrouow (Expand Search)
peterow » petrow (Expand Search), petersw (Expand Search)
petr » petri (Expand Search), petru (Expand Search), petro (Expand Search)
petruuo » petriuuo (Expand Search), petruuuo (Expand Search), petrouuo (Expand Search)
petrui » petriui (Expand Search), petruui (Expand Search), petroui (Expand Search), petri (Expand Search), petru (Expand Search)
petero » 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 ((((petruow OR peterow) OR (petr OR (petero OR peter))) o) OR ((petruuo OR petrui) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruow OR peterow) OR (petr OR (petero OR peter))) o) OR ((petruuo OR petrui) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruow OR peterow) OR (petr OR (petero OR peter))) o) OR ((petruuo OR petrui) _)). s.*.