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 algorithmss" » "_ optimizer algorithms", "_ optimized algorithms", "_ optimize algorithmss", "_ optimise algorithmss"
"_ 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 ((("_ optimizer algorithmss") or ("_ optimized algorithm"))))~.
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• Removing quotes may allow a broader search: (( qoe estimation algorithms ) or ((( _ optimizer algorithmss ) or ( _ optimized algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("qoe estimation algorithms") or ((("_ optimizer algorithmss") or ("_ optimized algorithm"))))*.