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

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 estimation algorithms\") OR (\"modified invasive approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( designed network estimation algorithms ) OR ( modified invasive approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("designed network estimation algorithms") OR ("modified invasive approximation algorithms"))*.