Perhaps you should try some spelling variations:
"geschafte obra poetica" » "geschafte der poetica", "geschafte fur poetica", "geschafte zur poetica", "geschafte ars poetica", "geschafte una poetica", "geschafte la poetica"
"testhefte zu poetica" » "beihefte zu poetica", "testheft i poetica", "testheft ii poetica", "testhefte la poetica", "testhefte de poetica", "testhefte e poetica"
"geschafte zu poetica" » "geschafte zur poetica", "geschafte fur poetica", "geschafte _ poetica", "geschafte la poetica", "geschafte de poetica", "geschafte e poetica"
"leithefte zu poetica" » "leithefte la poetica", "leithefte de poetica", "leithefte e poetica", "beihefte zu poetica", "lesehefte zu poetica"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("leithefte zu poetica") OR ("testhefte zu poetica"))) OR ((("geschafte zu poetica") OR ("geschafte obra poetica")))).
• Removing quotes may allow a broader search: (((( leithefte zu poetica ) or ( testhefte zu poetica ))) or ((( geschafte zu poetica ) or ( geschafte obra poetica )))).
• Adding a wildcard symbol may retrieve word variants: (((("leithefte zu poetica") or ("testhefte zu poetica"))) or ((("geschafte zu poetica") or ("geschafte obra poetica"))))*.