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

Try widening your search to All Fields.

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