Perhaps you should try some spelling variations:
"modified cover optimization algorithms" » "modified cover optimisation algorithm", "modified cover estimation algorithms", "modified cover estimation algorithm", "modified qoe optimization algorithms", "modified game optimization algorithms"
"modified coverage approximation algorithms" » "modified average approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified cover optimization algorithms\") OR (\"modified coverage approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified cover optimization algorithms ) OR ( modified coverage approximation algorithms ))~.
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