Perhaps you should try some spelling variations:
"same optimization algorithmssssssssssss" » "same optimisation algorithmsssssssssss", "same estimation algorithmssssssssssss", "same estimation algorithmsssssssssss", "game optimization algorithmssssssssssss", "stage optimization algorithmssssssssssss", "qoe optimization algorithmssssssssssss"
"parameter optimization algorithms" » "parameter optimisation algorithm", "parameter estimation algorithms", "parameter estimation algorithm", "parameters optimization algorithms"

Try widening your search to All Fields.

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