Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithm, optimized algorithms
estimation algorithms » estimation algorithm, optimisation algorithm, approximation algorithms
notion estimation » motion estimation
verified network » certified network, defined network

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