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

Try widening your search to All Fields.

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