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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified objective estimation algorithmssss\") OR (\"defined network optimization algorithm\"))~".
• Removing quotes may allow a broader search: (( modified objective estimation algorithmssss ) OR ( defined network optimization algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective estimation algorithmssss") OR ("defined network optimization algorithm"))*.