Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified learning due algorithm" » "mobile learning due algorithm", "modified caging due algorithm", "modified learning our algorithm", "modified learning adam algorithm", "modified learning _ algorithm", "modified learning data algorithm", "modified learning pbel 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 coverage approximation algorithms") OR ("modified learning due algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified coverage approximation algorithms\") OR (\"modified learning due algorithm\"))*".
• Removing quotes may allow a broader search: (( modified coverage approximation algorithms ) OR ( modified learning due algorithm ))*.