Perhaps you should try some spelling variations:
testing groups » testing group, nesting groups, testing grounds
groups studied » group studies, groups study
3 filosofiche » e filosofiche, ve filosoficke, e filosofica
filosofiche e » filosofiche lo, filosofica e, filosofici e
studied 3 » studied _, studied 5, studied 3.3
literatur » literature

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• Adding a wildcard symbol may retrieve word variants: testing groups studied 3 filosofiche e literatur*.