Perhaps you should try some spelling variations:
"modified a optimization algorithms" » "modified a optimisation algorithm", "modified a estimation algorithms", "modified a estimation algorithm", "modified _ optimization algorithms", "modified _ optimisation algorithms", "modified game optimization algorithms", "modified df optimization algorithms", "modified adam optimization algorithms"
"modified dfdaptive quantization algorithm" » "modified adaptive quantization algorithm", "modified dfdaptive estimation algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified a optimization algorithms\") OR (\"modified dfdaptive quantization algorithm\"))~".
• Removing quotes may allow a broader search: (( modified a optimization algorithms ) OR ( modified dfdaptive quantization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified a optimization algorithms") OR ("modified dfdaptive quantization algorithm"))*.