Perhaps you should try some spelling variations:
"_ optimisation algorithm" » "_ optimization algorithms", "_ estimation algorithm", "_ optimization algorithm"
"qoe optimization algorithm" » "qoe optimization algorithms", "qoe estimation algorithm", "qoe optimized algorithm", "game optimization algorithm", "_ optimization algorithm", "stage optimization algorithm"
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ approximation algorithms"

Try widening your search to All Fields.

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