Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
adaptive estimation » adaptive ventilation, quantile estimation, adaptive quantization
orca approximation » one approximation, _ approximation, time approximation
modified adaptive » modified passive

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified adaptive estimation algorithms ) OR ( modified orca approximation algorithm ))~".
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