Perhaps you should try some spelling variations:
"_ optimisation algorithm" » "_ optimization algorithms", "_ estimation algorithm", "_ estimation algorithms"
"post optimized algorithms" » "post optimizer algorithms", "post optimization algorithms", "post optimizer algorithmss", "most optimized algorithms"
"cost optimized algorithm" » "cost optimizer 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 algorithms") or ("cost optimized algorithm"))))~.
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• Adding a wildcard symbol may retrieve word variants: (("_ optimisation algorithm") or ((("post optimized algorithms") or ("cost optimized algorithm"))))*.