Perhaps you should try some spelling variations:
"der heating relaxation studies / der heating relaxation studies" » "der melting relaxation studies / der melting relaxation studies", "der breathing relaxation studies / der breathing relaxation studies", "der aging relaxation studies / der aging relaxation studies", "under heating relaxation studies / under heating relaxation studies", "aero heating relaxation studies / aero heating relaxation studies", "gear heating relaxation studies / gear heating relaxation studies"
"her teaching religion studies / her teaching religion studies" » "her teaching religious studies / her teaching religious studies", "her learning religion studies / her learning religion studies", "her making religion studies / her making religion studies", "her teaching religion study / her teaching religion study", "her teaching religion stated / her teaching religion stated", "der teaching religion studies / der teaching religion studies", "er teaching religion studies / er teaching religion studies", "other teaching religion studies / other teaching religion studies"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("her teaching religion studies / her teaching religion studies") OR ("der heating relaxation studies / der heating relaxation studies")).
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