Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified charging aided algorithm" » "modified caging aided algorithm", "modified carbon aided algorithm", "modified charging adam algorithm", "modified charging driven algorithm", "modified charging winner algorithm", "modified learning aided algorithm", "modified charging pile algorithm"

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