Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"modified df optimizer algorithms" » "modified df optimized algorithms", "modified df optimized algorithm", "modified _ optimized algorithms", "modified _ optimize algorithms", "modified _ optimizer algorithms", "modified adam optimizer algorithms", "modified bi1 optimizer algorithms"

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