Perhaps you should try some spelling variations:
"modified network approximation algorithms" » "certified network approximation algorithms", "defined network approximation algorithms", "modified near approximation algorithms"
"machinery using method algorithm" » "machinery using mom algorithm", "machines using method algorithm", "machinery nursing methods algorithm", "machinery focusing method algorithm", "machinery using metal algorithm"

You may be able to get more results by adjusting your search query.

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