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

Try widening your search to All Fields.

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