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

Try widening your search to All Fields.

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