Perhaps you should try some spelling variations:
"modified one approximation algorithm" » "modified one approximation algorithms", "modified time approximation algorithm", "modified _ approximation algorithm", "modified rough approximations algorithm", "modified male approximation algorithm", "modified near approximation algorithm", "modified orca approximation algorithm"
"mapping learning methods algorithm" » "machine learning methods algorithm", "enabling learning methods algorithm", "mapping nursing methods 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: "((\"mapping learning methods algorithm\") OR (\"modified one approximation algorithm\"))~".
• Removing quotes may allow a broader search: (( mapping learning methods algorithm ) OR ( modified one approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("mapping learning methods algorithm") OR ("modified one approximation algorithm"))*.