Perhaps you should try some spelling variations:
"defined network estimation algorithmssss" » "defined network estimation algorithms", "defined network optimization algorithmssss", "designed network estimation algorithmssss"
"modified parameter estimation algorithm" » "modified parameter estimates algorithm", "modified parameter optimization algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("defined network estimation algorithmssss") OR ("modified parameter estimation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"defined network estimation algorithmssss\") OR (\"modified parameter estimation algorithm\"))".
• Removing quotes may allow a broader search: (( defined network estimation algorithmssss ) OR ( modified parameter estimation algorithm )).
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