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

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