Perhaps you should try some spelling variations:
"modified dfdaptive estimation algorithm" » "modified adaptive ventilation algorithm", "modified quantile estimation algorithm", "modified adaptive estimation algorithm"
"modified a approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified df approximation algorithms", "modified adam approximation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified dfdaptive estimation algorithm") OR ("modified a approximation algorithms"))~.
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