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

Try widening your search to All Fields.

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