Perhaps you should try some spelling variations:
"_ optimization algorithm" » "_ optimization algorithms", "_ optimisation algorithm", "_ optimized algorithm"
"qoe estimation algorithms" » "qoe optimization algorithms", "qoe optimisation algorithm", "qoe approximation algorithms", "pose estimation algorithms", "_ estimation algorithms", "cover estimations algorithms"
"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 estimation algorithms") OR ("qoe estimation algorithm"))) or ("_ optimization algorithm"))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"qoe estimation algorithms\") OR (\"qoe estimation algorithm\"))) or (\"_ optimization algorithm\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("qoe estimation algorithms") OR ("qoe estimation algorithm"))) or ("_ optimization algorithm"))*.