Perhaps you should try some spelling variations:
"modified parameter estimation algorithms" » "modified parameter estimation algorithm", "modified parameter optimization algorithms", "modified parameter optimisation algorithm", "modified parameter estimates algorithms"
"modified delphi evolution algorithm" » "modified delphi solution algorithm", "modified delphi evolutionary algorithm", "modified delphi convolution algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified delphi evolution algorithm") OR ("modified parameter estimation algorithms"))*.
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