Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm
estimation algorithms » estimation algorithm, optimization algorithms, approximation algorithms
optimized algorithm » optimized algorithms, optimizer algorithms
risk optimized » write optimized

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• Performing a fuzzy search may retrieve terms with similar spellings: (( risk optimized algorithm ) or ( same ((optimisation algorithm) OR (estimation algorithms)) ))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( risk optimized algorithm ) or ( same ((optimisation algorithm) OR (estimation algorithms)) ))".
• Adding a wildcard symbol may retrieve word variants: (( risk optimized algorithm ) or ( same ((optimisation algorithm) OR (estimation algorithms)) ))*.