Perhaps you should try some spelling variations:
"qoe estimation algorithms" » "qoe estimation algorithm", "qoe optimization algorithms", "qoe optimisation algorithm", "pose estimation algorithms", "_ estimation algorithms", "cover estimations algorithms"
"_ optimizer algorithms" » "_ optimized algorithm", "_ optimization algorithms", "_ optimize algorithms", "_ optimise algorithms"
"_ optimized algorithms" » "_ optimized algorithm", "_ optimization 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 ((("_ optimizer algorithms") or ("_ optimized algorithms"))))~.
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• Adding a wildcard symbol may retrieve word variants: (("qoe estimation algorithms") or ((("_ optimizer algorithms") or ("_ optimized algorithms"))))*.