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"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified parameters optimization algorithms\") OR (\"defined network estimation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified parameters optimization algorithms ) OR ( defined network estimation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified parameters optimization algorithms") OR ("defined network estimation algorithm"))*.