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