Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
changing estimation » channel estimation, charging station
modified changing » modified caging

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified changing estimation algorithms ) or ( modified stochastic optimization algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified changing estimation algorithms ) OR ( modified stochastic optimization algorithm )).
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