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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified channel estimation algorithms") OR ("modified multiobjective optimisation algorithm"))~.
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