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 adaptive quantization algorithm" » "modified adaptive estimation algorithm", "modified adaptive ventilation algorithm", "modified passive quantization algorithm", "modified _daptive quantization algorithm", "modified dfdaptive quantization algorithm", "modified adamdaptive quantization algorithm"

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