Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"modified aging optimizer algorithms" » "modified aging optimized algorithms", "modified aging optimized algorithm", "modified aging optimization algorithms", "modified caging optimizer algorithms"

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