Perhaps you should try some spelling variations:
"modified objective optimisation algorithms" » "modified objective optimisation algorithm", "modified objective optimization algorithms", "modified objective estimation algorithms", "modified multiobjective optimization algorithms"
"modified network estimation algorithm" » "modified network optimization algorithm", "certified network estimation algorithm", "defined network estimation algorithm", "modified near estimation algorithm"

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