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

Try widening your search to All Fields.

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