Perhaps you should try some spelling variations:
optimisation algorithms » optimization algorithms, estimation algorithms, estimation algorithm
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
response optimisation » response optimization
risk optimisation » _ optimisation, risk estimation

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