Perhaps you should try some spelling variations:
"modified parameter estimation algorithms" » "modified parameter estimation algorithm", "modified parameter optimization algorithms", "modified parameter optimisation algorithm", "modified parameter estimates algorithms"
"modified seird approximation algorithms" » "modified time approximation algorithms", "modified network approximation algorithms", "modified near approximation algorithms"

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