Perhaps you should try some spelling variations:
"_ optimization algorithm" » "_ optimization algorithms", "_ optimisation algorithm", "_ estimation algorithm"
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ optimisation algorithm"
"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 ((("_ estimation algorithms") or ("_ optimization algorithm"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cost optimizer algorithms") OR ((("_ estimation algorithms") OR ("_ optimization algorithm")))).
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• Adding a wildcard symbol may retrieve word variants: (("cost optimizer algorithms") or ((("_ estimation algorithms") or ("_ optimization algorithm"))))*.