Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
passive optimization » bayesian optimization, game optimization, policy optimization
orca approximation » one approximation, _ approximation, time approximation
modified passive » modified adaptive

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