Perhaps you should try some spelling variations:
"modified adam optimization algorithms" » "modified adam optimisation algorithm", "modified adam estimation algorithms", "modified adam estimation algorithm", "modified game optimization algorithms", "modified stage optimization algorithms", "modified _ optimization algorithms", "modified df optimization algorithms", "modified near optimization algorithms"
"modified time approximation algorithms" » "modified one approximation algorithms", "modified _ approximation algorithms", "modified bi1 approximation algorithms", "modified male approximation algorithms"

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