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 objective allocation algorithmss" » "modified objective location algorithmss", "modified objective allocation algorithms", "modified objective allocation algorithmic"

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