Perhaps you should try some spelling variations:
"modified invasive optimization algorithms" » "modified invasive optimisation algorithm", "modified invasive estimation algorithms", "modified invasive estimation algorithm", "modified invasive optimisation algorithms", "modified invasive estimation algorithmss", "modified passive optimization algorithms"
"modified adam optimization algorithm" » "modified adam optimisation algorithm", "modified adam estimation algorithm", "modified adam estimation algorithms", "modified game optimization algorithm", "modified stage optimization algorithm", "modified _ optimization algorithm", "modified df optimization algorithm", "modified near optimization algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified adam optimization algorithm\") OR (\"modified invasive optimization algorithms\"))~".
• Removing quotes may allow a broader search: (( modified adam optimization algorithm ) OR ( modified invasive optimization algorithms ))~.
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