Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, estimation algorithm, estimation algorithms
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
simulation algorithmss » estimation algorithms
a simulation » _ simulation

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• Performing a fuzzy search may retrieve terms with similar spellings: (( policy ((optimization algorithm) OR (optimisation algorithm)) ) or ( a simulation algorithmss ))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( policy ((optimization algorithm) OR (optimisation algorithm)) ) or ( a simulation algorithmss ))".
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