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

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