Perhaps you should try some spelling variations:
"cover estimations algorithm" » "cover estimation algorithm", "cover estimation algorithms", "cover optimisation algorithm", "pose estimation algorithm"
"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 ("cover estimations algorithm"))) or ("_ optimized algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("qoe optimizer algorithms") OR ("cover estimations algorithm"))) OR ("_ optimized algorithms")).
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• Adding a wildcard symbol may retrieve word variants: (((("qoe optimizer algorithms") or ("cover estimations algorithm"))) or ("_ optimized algorithms"))*.