Perhaps you should try some spelling variations:
lit filosofia » la filosofia, di filosofia, alla filosofia
le literatura » la literatura, de literatura, e literatura
case studies » case study
filosofia le » filosofia de, filosofia e, filosofia del
studies lit » studies list, studies li, studies lia

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(test OR text) case studies lit filosofia le literatura".
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