Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified learning our algorithm" » "mobile learning our algorithm", "modified caging our algorithm", "modified learning source algorithm", "modified learning qspr algorithm", "modified learning _ algorithm", "modified learning due algorithm", "modified learning a algorithm"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified coverage approximation algorithms\") OR (\"modified learning our algorithm\"))~".
• Removing quotes may allow a broader search: (( modified coverage approximation algorithms ) OR ( modified learning our algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified coverage approximation algorithms") OR ("modified learning our algorithm"))*.