Perhaps you should try some spelling variations:
"modified objective optimization algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithm", "modified objective optimized algorithms", "modified multiobjective optimization algorithms"
"modified df estimation algorithms" » "modified df estimation algorithm", "modified df optimisation algorithm", "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 objective optimization algorithms\") OR (\"modified df estimation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified objective optimization algorithms ) OR ( modified df estimation algorithms ))~.
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