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