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