Perhaps you should try some spelling variations:
"modified aging convolution algorithms" » "modified aging evolution algorithm", "modified aging solution algorithm", "modified learning convolution algorithms", "modified caging convolution algorithms"
"modified coverage approximation algorithms" » "modified average approximation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified aging convolution algorithms") OR ("modified coverage approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified aging convolution algorithms ) or ( modified coverage approximation algorithms ))~.
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