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

Try widening your search to All Fields.

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