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"
"modified network estimation algorithms" » "modified network estimation algorithm", "modified network optimisation algorithm", "modified network approximation algorithms", "modified network optimization algorithms", "certified network estimation algorithms", "defined network estimation algorithms", "modified near estimation algorithms"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective optimization algorithms") OR ("modified network estimation algorithms"))~.
• Removing quotes may allow a broader search: (( modified objective optimization algorithms ) or ( modified network estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective optimization algorithms") or ("modified network estimation algorithms"))*.