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