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

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