Perhaps you should try some spelling variations:
"modified learning aided algorithm" » "mobile learning aided algorithm", "modified caging aided algorithm", "modified learning adam algorithm", "modified learning driven algorithm", "modified learning winner algorithm", "modified learning based algorithm", "modified learning model algorithm"
"modified average approximation algorithms" » "modified coverage approximation algorithms"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified average approximation algorithms") or ("modified learning aided algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified average approximation algorithms") OR ("modified learning aided algorithm")).
• Removing quotes may allow a broader search: (( modified average approximation algorithms ) or ( modified learning aided algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified average approximation algorithms") or ("modified learning aided algorithm"))*.