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

Try widening your search to All Fields.

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