Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified large evaluation algorithms" » "modified large evolution algorithm", "modified large estimation algorithms", "modified large convolution algorithms", "modified large variation algorithms", "modified load evaluation algorithms", "modified based evaluation algorithms", "modified male evaluation algorithms"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified coverage approximation algorithms") or ("modified large evaluation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified coverage approximation algorithms") OR ("modified large evaluation algorithms")).
• Removing quotes may allow a broader search: (( modified coverage approximation algorithms ) or ( modified large evaluation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified coverage approximation algorithms") or ("modified large evaluation algorithms"))*.