Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"modified deep evolution algorithm" » "modified deep solution algorithm", "modified deep evolutionary algorithm", "modified deep convolution algorithms", "modified delphi evolution algorithm", "modified df evolution algorithm", "modified near evolution algorithm"

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