Perhaps you should try some spelling variations:
"qoe optimization algorithms" » "qoe optimisation algorithm", "qoe estimation algorithms", "qoe estimation algorithm", "game optimization algorithms", "_ optimization algorithms", "stage optimization algorithms"
"qoe optimized algorithms" » "qoe optimized algorithm", "_ optimized algorithms"
"_ optimizer algorithms" » "_ optimized algorithm", "_ optimized algorithms", "_ optimize algorithms", "_ optimise algorithms"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("qoe optimization algorithms") or ((("qoe optimized algorithms") or ("_ optimizer algorithms"))))~.
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• Adding a wildcard symbol may retrieve word variants: (("qoe optimization algorithms") or ((("qoe optimized algorithms") or ("_ optimizer algorithms"))))*.