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