Perhaps you should try some spelling variations:
"designed network approximation algorithm" » "designed network approximation algorithms", "defined network approximation algorithm"
"modified parameters estimation algorithm" » "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: (("designed network approximation algorithm") OR ("modified parameters estimation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"designed network approximation algorithm\") OR (\"modified parameters estimation algorithm\"))*".
• Removing quotes may allow a broader search: (( designed network approximation algorithm ) OR ( modified parameters estimation algorithm ))*.