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

Try widening your search to All Fields.

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