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