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

Try widening your search to All Fields.

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