Perhaps you should try some spelling variations:
"modified channel optimization algorithms" » "modified channel optimisation algorithm", "modified channel estimation algorithms", "modified channel estimation algorithm", "modified game optimization algorithms", "modified market optimization algorithms"
"modified objective convolution algorithms" » "modified objective evolution algorithm", "modified objective solution algorithm"

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