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