Perhaps you should try some spelling variations:
"modified time approximation algorithms" » "modified one approximation algorithms", "modified _ approximation algorithms", "modified bi1 approximation algorithms", "modified male approximation algorithms"
"powder using method algorithm" » "powder using mom algorithm", "code using method algorithm", "boiler using method algorithm", "model using method algorithm", "powder nursing methods algorithm", "powder focusing method algorithm", "powder 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 time approximation algorithms") OR ("powder using method algorithm"))~.
• Removing quotes may allow a broader search: (( modified time approximation algorithms ) or ( powder using method algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified time approximation algorithms") or ("powder using method algorithm"))*.