Perhaps you should try some spelling variations:
"risk optimisation algorithm" » "risk optimization algorithms", "risk estimation algorithm", "risk estimation algorithms", "_ optimisation algorithm"
"_ optimise algorithms" » "_ optimized algorithms", "_ optimizer algorithms", "_ optimized algorithm"
"_ optimize algorithms" » "_ optimized algorithms", "_ optimizer algorithms", "_ optimized algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("risk optimisation algorithm") or ((("_ optimise algorithms") or ("_ optimize algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("risk optimisation algorithm") OR ((("_ optimise algorithms") OR ("_ optimize algorithms")))).
• Removing quotes may allow a broader search: (( risk optimisation algorithm ) or ((( _ optimise algorithms ) or ( _ optimize algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("risk optimisation algorithm") or ((("_ optimise algorithms") or ("_ optimize algorithms"))))*.