Perhaps you should try some spelling variations:
"modified adam optimization algorithms" » "modified adam optimisation algorithm", "modified adam estimation algorithm", "modified adam optimized algorithms", "modified game optimization algorithms", "modified stage optimization algorithms", "modified _ optimization algorithms", "modified df optimization algorithms", "modified near optimization algorithms"
"modified objective estimation algorithms" » "modified objective estimation algorithm", "modified objective optimisation algorithm", "modified objective approximation algorithms", "modified objective optimization algorithms", "modified objective allocation algorithms"

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