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"
"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: (("machinery using method algorithm") OR ("modified adam approximation algorithms"))~.
• Removing quotes may allow a broader search: (( machinery using method algorithm ) or ( modified adam approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("machinery using method algorithm") or ("modified adam approximation algorithms"))*.