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

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