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

Try widening your search to All Fields.

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