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

Try widening your search to All Fields.

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