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