Perhaps you should try some spelling variations:
"modified parameters optimisation algorithmss" » "modified parameters optimisation algorithm", "modified parameters optimization algorithms", "modified parameters estimation algorithm", "modified parameter optimization algorithmss", "modified parameter estimation algorithmss"
"modified objective estimation algorithms" » "modified objective estimation algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective allocation algorithms"

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