Perhaps you should try some spelling variations:
"modified delphi evolutionary algorithm" » "modified delphi evolution algorithm", "modified delphi solution algorithm"
"verified network optimisation algorithm" » "verified network optimization algorithms", "verified network estimation algorithm", "verified network estimation algorithms", "verified network optimization algorithm", "certified network optimisation algorithm", "defined network optimisation algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified delphi evolutionary algorithm") OR ("verified network optimisation algorithm"))~.
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