Perhaps you should try some spelling variations:
"post optimisation algorithm" » "post optimization algorithms", "post estimation algorithm", "post estimation algorithms", "robust optimization algorithm", "_ optimisation algorithm", "qoe optimization algorithm"
"_ optimizer algorithmss" » "_ optimizer algorithms", "_ optimized algorithms", "_ optimized algorithmss", "_ optimize algorithmss", "_ optimise algorithmss"
"qoe optimized algorithm" » "qoe optimized algorithms", "qoe optimizer algorithms", "_ optimized algorithm"

Try widening your search to All Fields.

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