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