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