Perhaps you should try some spelling variations:
"modified objective evolution algorithm" » "modified objective evolutionary algorithm", "modified objective allocation algorithm", "modified objective convolution algorithms", "modified objective estimation algorithm"
"modified study solution algorithm" » "modified study convolution algorithms", "modified study evolutionary algorithm", "modified study estimation algorithm", "modified student solutions algorithm", "modified study evaluation algorithm"

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