Perhaps you should try some spelling variations:
"modified cover optimization algorithms" » "modified cover estimation algorithms", "modified cover estimation algorithm", "modified cover optimized algorithms", "modified qoe optimization algorithms", "modified game optimization algorithms"
"modified notion optimisation algorithm" » "modified notion estimation algorithm", "modified notion estimation algorithms", "modified 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 notion optimisation algorithm") OR ("modified cover optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified notion optimisation algorithm ) or ( modified cover optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified notion optimisation algorithm") or ("modified cover optimization algorithms"))*.