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