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

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