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