Perhaps you should try some spelling variations:
petriow » peteriow (Expand Search), petriiow (Expand Search), petruiow (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petro » petero (Expand Search), petrio (Expand Search), petruo (Expand Search), petrov (Expand Search), petri (Expand Search), petru (Expand Search)
petrio » peterio (Expand Search), petriio (Expand Search), petruio (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (Expand Search)
petruuuui » peteruuuui (Expand Search), petriuuuui (Expand Search), petruuuuui (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 petr) o) OR (((petro OR petrio) OR (petriui OR petruuuui)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petriow OR peterow) OR petr) o) OR (((petro OR petrio) OR (petriui OR petruuuui)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petriow OR peterow) OR petr) o) OR (((petro OR petrio) OR (petriui OR petruuuui)) _)). s.*.