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