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

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