Perhaps you should try some spelling variations:
"modified parameters optimization algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameters optimization algorithms", "modified parameters optimisation algorithm", "modified parameters estimation algorithm"
"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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified parameters optimization algorithm") or ("defined network estimation algorithmss"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified parameters optimization algorithm") OR ("defined network estimation algorithmss")).
• Removing quotes may allow a broader search: (( modified parameters optimization algorithm ) or ( defined network estimation algorithmss )).
• Adding a wildcard symbol may retrieve word variants: (("modified parameters optimization algorithm") or ("defined network estimation algorithmss"))*.