Perhaps you should try some spelling variations:
"modified parameter estimation algorithmssss" » "modified parameter estimation algorithms", "modified parameter estimates algorithmssss", "modified parameter optimization algorithmssss"
"modified objective estimation algorithm" » "modified objective optimization algorithm", "modified objective allocation algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified parameter estimation algorithmssss") or ("modified objective estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified parameter estimation algorithmssss") OR ("modified objective estimation algorithm"))*.
• Removing quotes may allow a broader search: (( modified parameter estimation algorithmssss ) or ( modified objective estimation algorithm ))*.