Perhaps you should try some spelling variations:
"modified notion optimization algorithms" » "modified notion optimisation algorithm", "modified notion estimation algorithms", "modified notion estimation algorithm", "modified network optimization algorithms", "modified policy optimization algorithms", "modified allocation optimization algorithms"
"modified water solution algorithm" » "modified water evolution algorithm", "modified water convolution algorithms", "modified water evolutionary algorithm", "modified male solution algorithm", "modified water absorption algorithm"

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