Perhaps you should try some spelling variations:
"defined network estimation algorithmssss" » "defined network estimation algorithms", "defined network estimation algorithm", "defined network optimization algorithmssss", "designed network estimation algorithmssss", "defined network estimation algorithmsss"
"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: "((\"defined network estimation algorithmssss\") OR (\"modified objective approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( defined network estimation algorithmssss ) OR ( modified objective approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("defined network estimation algorithmssss") OR ("modified objective approximation algorithms"))*.