Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified learning mom algorithm" » "mobile learning mom algorithm", "modified caging mom algorithm", "modified learning adam algorithm", "modified learning mppt algorithm", "modified learning _ algorithm", "modified learning from algorithm", "modified learning model algorithm", "modified learnings from algorithm"

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

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