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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified network optimization algorithmss\") OR (\"modified objective approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified network optimization algorithmss ) OR ( modified objective approximation algorithms ))~.
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