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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("qoe optimisation algorithm") or ((("qoe optimized algorithm") OR ("qoe optimizer algorithms"))))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"qoe optimisation algorithm\") or (((\"qoe optimized algorithm\") OR (\"qoe optimizer algorithms\"))))".
• Removing quotes may allow a broader search: (( qoe optimisation algorithm ) or ((( qoe optimized algorithm ) OR ( qoe optimizer algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("qoe optimisation algorithm") or ((("qoe optimized algorithm") OR ("qoe optimizer algorithms"))))*.