Perhaps you should try some spelling variations:
"modified df solutions algorithm" » "modified df solution algorithm", "modified df evolutionary algorithm", "modified _ solutions algorithm", "modified up solutions algorithm", "modified _ solution algorithm", "modified adam solutions algorithm", "modified bi1 solutions algorithm"
"modified objective evolution algorithm" » "modified objective evolutionary algorithm", "modified objective allocation algorithm", "modified objective solution algorithm", "modified objective convolution algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified df solutions algorithm") OR ("modified objective evolution algorithm"))~.
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