Perhaps you should try some spelling variations:
"modified stochastic optimisation algorithm" » "modified stochastic optimization algorithm", "modified static optimization algorithm", "modified stochastic configuration algorithm", "modified stochastic optimization algorithms", "modified stochastic estimation algorithm"
"modified df estimation algorithms" » "modified df estimation algorithm", "modified df optimization algorithms", "modified df approximation algorithms", "modified _ estimation algorithms", "modified adam estimation algorithms", "modified bi1 estimation algorithms"

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