Perhaps you should try some spelling variations:
"modified cover optimization algorithms" » "modified cover optimisation algorithm", "modified cover estimation algorithms", "modified cover estimation algorithm", "modified cover optimisation algorithms", "modified cover estimation algorithmss", "modified qoe optimization algorithms", "modified game optimization algorithms"
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimisation algorithm", "modified objective estimation algorithm", "modified objective estimation algorithms"

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