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

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