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

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