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

Try widening your search to All Fields.

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