Perhaps you should try some spelling variations:
"modified positive evolutionary algorithm" » "modified positive evolution algorithm", "modified objective evolutionary algorithm", "modified positive solutions algorithm", "modified passive evolutionary algorithm", "modified adaptive evolutionary algorithm"
"modified delphi solution algorithm" » "modified delphi evolution algorithm", "modified delphi convolution algorithms", "modified delphi estimation algorithm"

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