Perhaps you should try some spelling variations:
"modified carbon optimization algorithms" » "modified carbon optimisation algorithm", "modified carbon estimation algorithms", "modified carbon estimation algorithm", "modified carbon optimisation algorithms", "modified carbon estimation algorithmss", "modified market optimization algorithms"
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimisation algorithm", "modified objective estimation algorithm", "modified objective estimation algorithms"

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