Perhaps you should try some spelling variations:
"modified df optimization algorithmssssss" » "modified df optimisation algorithm", "modified df optimisation algorithmsssss", "modified df estimation algorithmssssss", "modified df estimation algorithmsssss", "modified _ optimization algorithmssssss", "modified qoe optimization algorithmssssss", "modified _ optimisation algorithmssssss", "modified adam optimization algorithmssssss", "modified bi1 optimization algorithmssssss"
"modified parameter optimization algorithms" » "modified parameter optimisation algorithm", "modified parameter estimation algorithms", "modified parameter estimation algorithm", "modified parameters 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: (("modified df optimization algorithmssssss") or ("modified parameter optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified df optimization algorithmssssss") OR ("modified parameter optimization algorithms")).
• Removing quotes may allow a broader search: (( modified df optimization algorithmssssss ) or ( modified parameter optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified df optimization algorithmssssss") or ("modified parameter optimization algorithms"))*.