Perhaps you should try some spelling variations:
"lesehefte zu poetica" » "leseheft zur poetica", "geschafte zu poetica", "beihefte zu poetica", "lesehefte la poetica", "lesehefte e poetica", "lesehefte a poetica"
"leithefte zu poetica" » "leithefte la poetica", "leithefte e poetica", "leithefte a poetica"
"leithefte de poetica" » "leithefte de politica", "leithefte la poetica", "leithefte de politicas"

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 ("leithefte de poetica"))) OR ("lesehefte zu poetica")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"leithefte zu poetica\") OR (\"leithefte de poetica\"))) or (\"lesehefte zu poetica\"))".
• Removing quotes may allow a broader search: (((( leithefte zu poetica ) OR ( leithefte de poetica ))) or ( lesehefte zu poetica )).
• Adding a wildcard symbol may retrieve word variants: (((("leithefte zu poetica") OR ("leithefte de poetica"))) or ("lesehefte zu poetica"))*.