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

Try widening your search to All Fields.

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