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