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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified multiobjective optimization algorithm") OR ("modified cover optimisation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified multiobjective optimization algorithm\") OR (\"modified cover optimisation algorithms\"))".
• Removing quotes may allow a broader search: (( modified multiobjective optimization algorithm ) OR ( modified cover optimisation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective optimization algorithm") OR ("modified cover optimisation algorithms"))*.