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

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 ((("_ optimized algorithms") or ("qoe optimizer algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("risk optimisation algorithm") OR ((("_ optimized algorithms") OR ("qoe optimizer algorithms")))).
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• Adding a wildcard symbol may retrieve word variants: (("risk optimisation algorithm") or ((("_ optimized algorithms") or ("qoe optimizer algorithms"))))*.