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

Try widening your search to All Fields.

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