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

Try widening your search to All Fields.

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