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

Try widening your search to All Fields.

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