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

Try widening your search to All Fields.

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