Perhaps you should try some spelling variations:
"geschafte fur poetica" » "geschafte der poetica", "geschafte _ poetica", "geschafte und poetica", "geschafte fur political", "geschafte obra poetica", "geschafte her poetical"
"testhefte zu poetica" » "geschafte zu poetica", "beihefte zu poetica", "testheft i poetica", "testhefte la poetica", "testhefte de poetica", "testhefte 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 fur poetica")).
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