Perhaps you should try some spelling variations:
"_ optimise algorithmss" » "_ optimized algorithms", "_ optimizer algorithms", "_ optimize algorithmss", "_ optimized algorithmss"
"qoe optimized algorithm" » "qoe optimized algorithms", "qoe optimizer algorithms", "_ optimized algorithm"
"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 optimized algorithm") or ("_ optimise algorithmss"))) or ("qoe estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("qoe optimized algorithm") OR ("_ optimise algorithmss"))) OR ("qoe estimation algorithm")).
• Removing quotes may allow a broader search: (((( qoe optimized algorithm ) or ( _ optimise algorithmss ))) or ( qoe estimation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("qoe optimized algorithm") or ("_ optimise algorithmss"))) or ("qoe estimation algorithm"))*.