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

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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 algorithms\"))~".
• Removing quotes may allow a broader search: (( modified objective optimisation algorithms ) OR ( modified network estimation algorithms ))~.
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