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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("qoe estimation algorithms") or ((("_ optimisation algorithm") or ("_ optimized algorithm"))))~.
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• Adding a wildcard symbol may retrieve word variants: (("qoe estimation algorithms") or ((("_ optimisation algorithm") or ("_ optimized algorithm"))))*.