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