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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("qoe optimized algorithms") or ("_ optimized algorithms"))) or ("cover estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("qoe optimized algorithms") OR ("_ optimized algorithms"))) OR ("cover estimation algorithm")).
• Removing quotes may allow a broader search: (((( qoe optimized algorithms ) or ( _ optimized algorithms ))) or ( cover estimation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("qoe optimized algorithms") or ("_ optimized algorithms"))) or ("cover estimation algorithm"))*.