Perhaps you should try some spelling variations:
"qoe optimisation algorithm" » "qoe optimization algorithms", "qoe estimation algorithm", "qoe optimization algorithm", "_ optimisation algorithm", "game optimization algorithm"
"qoe estimation algorithms" » "qoe estimation algorithm", "qoe optimization algorithms", "qoe approximation algorithms", "pose estimation algorithms", "_ estimation algorithms", "cover estimations 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: (("_ optimized algorithms") or ((("qoe optimisation algorithm") OR ("qoe estimation algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("_ optimized algorithms") OR ((("qoe optimisation algorithm") OR ("qoe estimation algorithms")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"_ optimized algorithms\") or (((\"qoe optimisation algorithm\") OR (\"qoe estimation algorithms\"))))".
• Removing quotes may allow a broader search: (( _ optimized algorithms ) or ((( qoe optimisation algorithm ) OR ( qoe estimation algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("_ optimized algorithms") or ((("qoe optimisation algorithm") OR ("qoe estimation algorithms"))))*.