Perhaps you should try some spelling variations:
"_ optimisation algorithm" » "_ optimization algorithms", "_ estimation algorithms", "_ optimization algorithm"
"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 ((("_ optimisation algorithm") or ("qoe optimized algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("risk estimation algorithm") OR ((("_ optimisation algorithm") OR ("qoe optimized algorithms")))).
• Removing quotes may allow a broader search: (( risk estimation algorithm ) or ((( _ optimisation algorithm ) or ( qoe optimized algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("risk estimation algorithm") or ((("_ optimisation algorithm") or ("qoe optimized algorithms"))))*.