Perhaps you should try some spelling variations:
petruow » peteruow (Expand Search), petriuow (Expand Search), petruuow (Expand Search)
petriuuow » peteriuuow (Expand Search), petriiuuow (Expand Search), petruiuuow (Expand Search)
petriow » peteriow (Expand Search), petriiow (Expand Search), petruiow (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petruoi » peteruoi (Expand Search), petriuoi (Expand Search), petruuoi (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (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 (petriuuow OR petriow)) OR petr) o) OR ((petruoi OR (petrui OR petriui)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruow OR (petriuuow OR petriow)) OR petr) o) OR ((petruoi OR (petrui OR petriui)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruow OR (petriuuow OR petriow)) OR petr) o) OR ((petruoi OR (petrui OR petriui)) _)). s.*.