Perhaps you should try some spelling variations:
"_ estimation algorithms" » "_ optimization algorithms", "_ optimisation algorithm", "_ approximation algorithms"
"pose optimized algorithms" » "pose optimized algorithm", "pose optimizer algorithms", "pose optimization algorithms", "poses optimized algorithms", "post optimized algorithms", "jose optimized algorithms"
"qoe estimation algorithm" » "pose estimation algorithm", "cover estimations algorithm", "qoe optimization algorithm"

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