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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified parameter estimation algorithmssss\") OR (\"modified objective estimation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified parameter estimation algorithmssss ) OR ( modified objective estimation algorithms ))~.
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