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

Try widening your search to All Fields.

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