Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"how learning estimation algorithm" » "how learning emotion algorithm", "how lighting estimation algorithm", "shot learning estimation algorithm", "when learning estimation algorithm", "_ learning estimation 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: "((\"how learning estimation algorithm\") OR (\"modified notion approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( how learning estimation algorithm ) OR ( modified notion approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("how learning estimation algorithm") OR ("modified notion approximation algorithms"))*.