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

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