Perhaps you should try some spelling variations:
petrie » petri (Expand Search), petris (Expand Search), patrie (Expand Search), peterie (Expand Search), petriie (Expand Search), petruie (Expand Search)
petra » petri (Expand Search), petru (Expand Search), petro (Expand Search), petera (Expand Search), petria (Expand Search), petrua (Expand Search)
peterow » petrow (Expand Search)
petrouo » peterouo (Expand Search), petriouo (Expand Search), petruouo (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), petri (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 ((((petrie OR petra) OR (peterow OR petrouo)) o) OR ((petr OR (peteri OR peteri)) _)). s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrie OR petra) OR (peterow OR petrouo)) o) OR ((petr OR (peteri OR peteri)) _)). s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petrie OR petra) OR (peterow OR petrouo)) o) OR ((petr OR (peteri OR peteri)) _)). s.*.