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