Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified saline solution algorithms" » "modified saline solution algorithm", "modified saline evolution algorithm", "modified saline convolution algorithms", "modified caging solution algorithms", "modified male solution algorithms", "modified passive solution algorithms"

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 coverage approximation algorithms") OR ("modified saline solution algorithms"))~.
• Removing quotes may allow a broader search: (( modified coverage approximation algorithms ) or ( modified saline solution algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified coverage approximation algorithms") or ("modified saline solution algorithms"))*.