Perhaps you should try some spelling variations:
"attribute optimization algorithmssssss" » "attribute optimization algorithms", "attribute optimisation algorithm", "attribute optimization algorithmsssssss", "attribute optimisation algorithmssssss", "attribute estimation algorithmssssss", "attributed optimization algorithmssssss", "attributes optimization algorithmssssss"
"parameter optimization algorithm" » "parameter optimization algorithms", "parameter optimisation algorithm", "parameter estimation algorithm", "parameters optimization algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("attribute optimization algorithmssssss") or ("parameter optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("attribute optimization algorithmssssss") OR ("parameter optimization algorithm")).
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