Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified learning source algorithm" » "mobile learning source algorithm", "modified caging source algorithm", "modified learning our algorithm", "modified learning search algorithm", "modified learning journey 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 learning source algorithm") or ("modified notion approximation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified learning source algorithm") OR ("modified notion approximation algorithms"))*.
• Removing quotes may allow a broader search: (( modified learning source algorithm ) or ( modified notion approximation algorithms ))*.