Perhaps you should try some spelling variations:
"modified static estimation algorithmssss" » "modified static estimation algorithms", "modified static estimation algorithm", "modified static optimization algorithmssss"
"modified parameters optimization algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameters optimization algorithms", "modified parameters optimisation algorithm", "modified parameters estimation algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified static estimation algorithmssss\") OR (\"modified parameters optimization algorithm\"))~".
• Removing quotes may allow a broader search: (( modified static estimation algorithmssss ) OR ( modified parameters optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified static estimation algorithmssss") OR ("modified parameters optimization algorithm"))*.