Perhaps you should try some spelling variations:
"modified time approximation algorithm" » "modified time approximation algorithms", "modified one approximation algorithm", "modified _ approximation algorithm", "modified bi1 approximation algorithm", "modified male approximation algorithm"
"modified adaptive solution algorithm" » "modified adaptive evolution algorithm", "modified adaptive convolution algorithms", "modified adaptive evolutionary algorithm", "modified passive solution algorithm"

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

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