Perhaps you should try some spelling variations:
"modified based optimisation algorithm" » "modified based optimization algorithms", "modified based estimation algorithm", "modified based estimation algorithms", "modified game optimization algorithm", "modified male optimisation algorithm"
"designed network approximation algorithms" » "defined network approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"designed network approximation algorithms\") OR (\"modified based optimisation algorithm\"))~".
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