Perhaps you should try some spelling variations:
"one optimization algorithms" » "one estimation algorithms", "one estimation algorithm", "one optimizer algorithms", "qoe optimization algorithms", "game optimization algorithms", "_ optimization algorithms"
"_ optimisation algorithm" » "_ estimation algorithm", "_ estimation algorithms", "_ optimization 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: (((("one optimization algorithms") or ("_ optimized algorithms"))) or ("_ optimisation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("one optimization algorithms") OR ("_ optimized algorithms"))) OR ("_ optimisation algorithm")).
• Removing quotes may allow a broader search: (((( one optimization algorithms ) or ( _ optimized algorithms ))) or ( _ optimisation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("one optimization algorithms") or ("_ optimized algorithms"))) or ("_ optimisation algorithm"))*.