Perhaps you should try some spelling variations:
"modified parameters optimization algorithms" » "modified parameter optimization algorithms", "modified parameter estimation algorithms", "modified parameters optimisation algorithm", "modified parameters estimation algorithms", "modified parameters optimized algorithms"
"defined network estimation algorithm" » "defined network optimization algorithm", "designed network estimation algorithm"

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 algorithm") OR ("modified parameters optimization algorithms"))~.
• Removing quotes may allow a broader search: (( defined network estimation algorithm ) or ( modified parameters optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("defined network estimation algorithm") or ("modified parameters optimization algorithms"))*.