Perhaps you should try some spelling variations:
"modified response approximation algorithm" » "modified response approximation algorithms", "modified one approximation algorithm", "modified response association algorithm"
"modified parameters optimisation algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameters optimization algorithms", "modified parameters estimation algorithm", "modified parameters estimation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified response approximation algorithm") OR ("modified parameters optimisation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified response approximation algorithm\") OR (\"modified parameters optimisation algorithm\"))*".
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