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