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

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