Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified objective evolution algorithms" » "modified objective evolution algorithm", "modified objective convolution algorithms", "modified objective solution algorithm", "modified objective evolutionary algorithms", "modified objective allocation algorithms"

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