Perhaps you should try some spelling variations:
"modified parameters estimation algorithmss" » "modified parameters estimation algorithm", "modified parameters optimization algorithms", "modified parameters estimation algorithms", "modified parameters optimization algorithmss", "modified parameters optimisation algorithms", "modified parameter estimation algorithmss", "modified parameter estimates algorithmss", "modified parameter optimization algorithmss"
"modified df estimation algorithms" » "modified df estimation algorithm", "modified df optimization algorithms", "modified df optimisation algorithm", "modified _ estimation algorithms", "modified adam estimation algorithms", "modified bi1 estimation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified df estimation algorithms") OR ("modified parameters estimation algorithmss"))~.
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