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