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

You may be able to get more results by adjusting your search query.

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