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

Try widening your search to All Fields.

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