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

Try widening your search to All Fields.

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