Perhaps you should try some spelling variations:
"modified adam approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified df approximation algorithms", "modified near approximation algorithms"
"model using method algorithm" » "model using mom algorithm", "model nursing methods algorithm", "model focusing method algorithm", "model using metal algorithm", "code using method algorithm", "models nursing method algorithm", "powder using method 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 adam approximation algorithms") or ("model using method algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified adam approximation algorithms") OR ("model using method algorithm")).
• Removing quotes may allow a broader search: (( modified adam approximation algorithms ) or ( model using method algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified adam approximation algorithms") or ("model using method algorithm"))*.