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

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