Perhaps you should try some spelling variations:
"lesehefte zu poetica" » "leseheft zur poetica", "geschafte zu poetica", "beihefte zu poetica", "lesehefte la poetica", "lesehefte de poetica", "lesehefte a poetica"
"leithefte zu poetica" » "leithefte la poetica", "leithefte de poetica", "leithefte a poetica", "beihefte zu poetica", "testhefte zu poetica"
"lesehefte e poetica" » "lesehefte de poetica", "lesehefte et poeticae", "lesehefte _ 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: (("leithefte zu poetica") OR ((("lesehefte zu poetica") OR ("lesehefte e poetica")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"leithefte zu poetica\") or (((\"lesehefte zu poetica\") OR (\"lesehefte e poetica\"))))".
• Removing quotes may allow a broader search: (( leithefte zu poetica ) or ((( lesehefte zu poetica ) OR ( lesehefte e poetica )))).
• Adding a wildcard symbol may retrieve word variants: (("leithefte zu poetica") or ((("lesehefte zu poetica") OR ("lesehefte e poetica"))))*.