Perhaps you should try some spelling variations:
"testhefte zu poetica" » "leithefte zu poetica", "geschafte zu poetica", "beihefte zu poetica", "testhefte la poetica", "testhefte de poetica", "testhefte a poetica"
"lesehefte zu poetica" » "leithefte zu poetica", "leseheft zur poetica", "geschafte zu poetica", "lesehefte la poetica", "lesehefte de poetica", "lesehefte a poetica"
"lesehefte e poetica" » "lesehefte de poetica", "lesehefte et poeticae", "lesehefte a poetical"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("testhefte zu poetica") OR ((("lesehefte zu poetica") OR ((("lesehefte e poetica") OR ("lesehefte _ poetical")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"testhefte zu poetica\") or (((\"lesehefte zu poetica\") or (((\"lesehefte e poetica\") OR (\"lesehefte _ poetical\"))))))".
• Removing quotes may allow a broader search: (( testhefte zu poetica ) or ((( lesehefte zu poetica ) or ((( lesehefte e poetica ) OR ( lesehefte _ poetical )))))).
• Adding a wildcard symbol may retrieve word variants: (("testhefte zu poetica") or ((("lesehefte zu poetica") or ((("lesehefte e poetica") OR ("lesehefte _ poetical"))))))*.