Perhaps you should try some spelling variations:
"modified multiobjective optimized algorithm" » "modified multiobjective optimization algorithm", "modified multiobjective optimized algorithms", "modified multiobjective optimizer algorithms"
"modified channel estimation algorithms" » "modified channel estimation algorithm", "modified channel optimization algorithms", "modified channel optimisation algorithm", "modified channel excitation algorithms"

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