Perhaps you should try some spelling variations:
"parameters optimization algorithms" » "parameter optimization algorithms", "parameter estimation algorithms", "parameters optimisation algorithm", "parameters estimation algorithms", "parameters estimation algorithm"
"notion optimization algorithmsssssss" » "notion optimisation algorithmssssss", "notion estimation algorithmsssssss", "notion estimation algorithmssssss", "network optimization algorithmsssssss", "policy optimization algorithmsssssss", "allocation optimization algorithmsssssss"

Try widening your search to All Fields.

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