Perhaps you should try some spelling variations:
"modified df optimization algorithm" » "modified df optimization algorithms", "modified df estimation algorithm", "modified df estimation algorithms", "modified _ optimization algorithm", "modified qoe optimization algorithm", "modified _ optimisation algorithm", "modified adam optimization algorithm", "modified bi1 optimization algorithm"
"defined network optimisation algorithm" » "defined network optimization algorithms", "defined network estimation algorithm", "defined network estimation algorithms", "defined network optimization algorithm"

You may be able to get more results by adjusting your search query.

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