Perhaps you should try some spelling variations:
"modified network approximation algorithms" » "certified network approximation algorithms", "defined network 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 network approximation algorithms") or ("model using method algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified network approximation algorithms") OR ("model using method algorithm")).
• Removing quotes may allow a broader search: (( modified network approximation algorithms ) or ( model using method algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified network approximation algorithms") or ("model using method algorithm"))*.